Voz : H.323

Edições do fax relay de H.323 T.38

14 Outubro 2016 - Tradução por Computador
Outras Versões: Versão em PDFpdf | Inglês (22 Agosto 2015) | Feedback


Índice


Introdução

Os problemas de retransmissão de fax T.38 são associados geralmente a problemas de interoperabilidade entre gateways de fax Cisco T.38 de terceiros. Este documento contém exemplos detalhados do comando de depuração de erros de chamadas de retransmissão de fax T.38 bem e malsucedidas. Estes comandos de depuração de erros contêm comentários para fornecer pontos de referência para que seja possível resolver problemas tais como questões de interoperabilidade. Os comandos pertinentes de troubleshooting e verificação também são fornecidos neste documento.

Pré-requisitos

Requisitos

Os leitores deste documento devem ser conhecedors dos conceitos básicos do fax relay. Refira o guia de Troubleshooting do fax relay para obter mais informações sobre dos conceitos e das etapas de Troubleshooting básicas do fax relay.

Componentes Utilizados

Este documento não se restringe a versões de software e hardware específicas.

As informações neste documento foram criadas a partir de dispositivos em um ambiente de laboratório específico. Todos os dispositivos utilizados neste documento foram iniciados com uma configuração (padrão) inicial. Se a sua rede estiver ativa, certifique-se de que entende o impacto potencial de qualquer comando.

Convenções

Consulte as Convenções de Dicas Técnicas da Cisco para obter mais informações sobre convenções de documentos.

Princípios de T.38

Um sintoma comum de problemas do fax relay de T.38 é uma chamada de voz que seja estabelecida onde um tom do fax é ouvido, mas a negociação do fax não é terminada e o atendimento é deixado cair eventualmente. Esta edição é associada frequentemente com o gateway de Cisco T.38 e os problemas de interoperabilidade de gateway da terceira de T.38.

O fax relay de T.38 é transmissão de fax do tempo real; isto é, duas máquinas de fax que se comunicam um com o otro como se havia uma linha telefônica direta entre os dois. O fax relay é configurado com alguns comandos adicionais nos gateway dial peer que já têm sido definidos e configurados para chamadas de voz.

Cisco fornece dois métodos para o fax relay: um método proprietário Cisco e um método baseados no padrão de T.38 do ITU-T. Na maioria de Plataformas, o fax relay de Cisco é o padrão se um método do fax não é configurado explicitamente. O fax relay de Cisco é descrito em configurar o fax relay de Cisco.

Limitações de T.38

Neste momento, o fax relay de Cisco T.38 tem estas limitações:

  • A Interoperabilidade de T.38 exige a versão 2 de Cisco H.323.

  • T.38 não é apoiado em concentradores da Cisco MC3810 Series com uma voice compression module (VCM).

  • T.38 não é apoiado pelo proxy de H.323 do Multimedia Conference Manager (MCM).

  • Somente o User Datagram Protocol (UDP) é executado para H.323 T.38.

  • Alguns gateways e porteiros da terceira não são compatíveis com os ciscos voices gateways para o fax relay de T.38 porque os fabricantes diferentes podem escolher determinadas partes de H.323 e de T.38 executar em seus gateways e porteiros. Os testes da Interoperabilidade da Voz com estes gateways e porteiros da terceira devem ser executados para certificar-se de que o fax relay de T.38 pode ser bem sucedido.

Negociação de T.38

Esta seção fornece um breve sumário passo a passo de como a negociação de T.38 é segurada dentro dos Cisco gateway. Refira o guia de Troubleshooting do fax relay para obter mais informações sobre dos princípios do fax relay.

  1. Na mensagem de instalação inicial, a capacidade dos dados de T.38 é anunciada pelo gateway de origem (OGW).

    Se o gateway de terminação (TGW) apoia a capacidade dos dados de T.38, pode retransmitir que informação nos mensagens subsequente enviados ao OGW.

  2. Uma vez que uma chamada de voz está estabelecida e o processador do sinal digital (DSP) no TGW detecta um tom do fax, a máquina de estado do provedor de serviços de telefonia por voz (VTSP) informa o trecho de chamada de H.323, que negocia o modo de T.38 com o OGW.

  3. Em cima do reconhecimento do modo de T.38, o canal de áudio é fechado, e o canal lógico de T.38 é aberto no ambas as extremidades.

  4. A nível do código VTSP, a transferência do codificador-decodificador do fax (codec) ocorre.

  5. Em cima de uma transferência aberta bem sucedida do canal lógico (OLC) e do codec de T.38, o VTSP participa no fax - modo.

  6. Após a conclusão da transmissão de fax, o atendimento é revertido de volta a uma chamada de voz.

    Nota: Durante a negociação do modo de T.38, se a outra extremidade não reconhece o modo de T.38, o atendimento é revertido de volta a uma chamada de voz e desligado. Se o reconhecimento negativo é recebido da outra extremidade em relação a T.38 OLC, a seguir o atendimento igualmente está revertido de volta a uma chamada de voz e desligado.

Pesquisa de defeitos de T.38

Dicas de Troubleshooting para o fax relay de H.323 ou de T.38 do SORVO

A fim pesquisar defeitos o fax relay de T.38, execute estas etapas:

  • Certifique-se de que você pode fazer uma chamada de voz. Confirme que as chamadas de voz normais podem ser terminadas antes que você investigue a Conectividade do fax. Se não houver nenhum telefone conectado, desligue o fax e conecte um telefone regular. Se as chamadas de voz normais não conectam, a edição pode ser VoX-relacionada, e você pode pesquisar defeitos o problema enquanto uma edição normal da conectividade de voz antes que você continue com Troubleshooting de Fax.

  • Certifique-se de que o protocolo desejado do fax esteve ajustado com o comando fax protocol em ambos os gateways de origem e finalização.

  • Certifique-se de que o protocolo do fax está configurado como T.38 a nível da configuração global ou na configuração de dial peer em nível para ambos os gateways de origem e finalização.

comandos debug e show

Os comandos debug and show usados pesquisando defeitos o fax relay de T.38 são:

  • debugar o inout do ccapi do voip — Este comando segue o trajeto da execução com o Application Program Interface do Controle de chamadas (API), que serve como a relação entre o aplicativo da sessão de chamada e o software rede-específico subjacente. Você pode usar a saída deste comando compreender como os atendimentos estão sendo segurados pelo gateway de voz.

  • debugar o vtsp todo — Este comando permite estes debuga comandos VTSP: o debug vtsp session, debuga o erro do vtsp, e debuga o dsp do vtsp.

  • debugar o asn1 h245 — Este comando indica os índices do Abstract Syntax Notation One (ASN.1) das mensagens H.245. Para desabilitar o resultado do debug, não use nenhum formulário deste comando.

  • debugar cch323 h245 — Este comando fornece o traço da transição de estado da máquina de estado H.245 baseada nos eventos processados. Para desabilitar o resultado do debug, não use nenhum formulário deste comando.

  • mostre o resumo do fax ativo do atendimento — Este comando indica a informação de chamada para as transmissões de fax de armazenamento e de encaminhamento em andamento.

  • mostre o fax do histórico da chamada — Este comando indica o histórico da chamada recente para fax.

Saída de um atendimento bem sucedido de T.38

Esta seção detalha a anatomia de um fax bem sucedido de T.38 setup entre um roteador do AS5300 Series e um Modular Access Router do Cisco 3640. As saídas do comando debug and show foram capturadas no Universal Gateway do Cisco AS5300 como o TGW IO 12.2:

saída do comando debug vtsp all

!---After the voice call setup:


!--- Usually, after the call is connected, the ccCallConnect debug 
!--- message is seen as follows:


May 3 21:41:21.424: ccCallConnect (callID=0x9), prog_ind = 0 

May? 3 21:41:21.424: ssaFlushPeerTagQueue cid(9) peer list: (empty) 

May 3 21:41:21.424: H.225 SM: process event H225_EVENT_SETUP_CFM, for callID 9 

May 3 21:41:21.424: cch323_run_h225_sm: 
   received event H225_EVENT_SETUP_CFM while at state H225_ALERT 

May 3 21:41:21.424: H.225 SM: 
   changing from H225_ALERT state to H225_ACTIVE state for callID 9 

May 3 21:41:21.424: ==== PI in cch323_h225_generic_send_setup_cfm = 0 


!---After the voice call is established, 
   the TGW DSP detected fax tone:

May 3 21:41:26.741: vtsp_process_dsp_message: MSG_TX_TONE_DETECT: 
   type=0 trigger=1 tone_id=0

May 3 21:41:26.741: vtsp:[1:D (10), S_CONNECT, E_DSP_TONE_DETECT] 

May 3 21:41:26.745: vtsp_modem_proto_from_cdb: cap_modem_proto 0 

May 3 21:41:26.745: cc_api_call_feature: (vdbPtr=0x624130C0, 
   callID=0xA,feature_ind.type=1 


!---Switched to fax mode:
 
May 3 21:41:26.745: act_lfax_switch: 
   cap_modem_proto=16, fax_relay_on=1, state=19 

May 3 21:41:26.745: vtsp_t38_switchover:2 - data_mode:1 

!--- Note that 2 means T.38; 1 means Cisco proprietary.



May 3 21:41:26.745: cc_api_t38_fax_start 
   (dstVdbPtr=0x61B45A90, dstCallId=0x9, srcCallId=0xA,????
caps={codec=0x10000, fax_rate=0x2, vad=0x2, modem=0x0codec_bytes=160, signal_type=1}) 

May 3 21:41:26.745: vtsp_timer: 2016656 

May 3 21:41:26.745: sess_appl: ev(28=CC_EV_CALL_FEATURE), cid(10), disp(0) 

May 3 21:41:26.745: cid(10)st(SSA_CS_ACTIVE)ev(SSA_EV_CALL_FEATURE) 

oldst(SSA_CS_CONFERENCED_ALERT)cfid(5)csize(0)in(0)fDest(0) 

May 3 21:41:26.745: -cid2(9)st2(SSA_CS_ACTIVE)oldst2(SSA_CS_CONFERENCING_ALERT) 

!---H245 ModeRequest was sent to the OGW:
 
May 3 21:41:26.745: ccCallFeature (callID=0x9, feature.type=1)
   Set new event H245_EVENT_MR, for callID 9 

May 3 21:41:26.745: cch323_run_h245_mr_sm: received event 
   H245_EVENT_MR while at state H245_MR_NONE?
 
!---Above, state H245_MR_NONE refers to ModeRequest state.
 

May 3 21:41:26.745: H245 MSC OUTGOING PDU ::= 

value MultimediaSystemControlMessage ::= request : requestMode :  

??? { 

????? sequenceNumber 1 

????? requestedModes  

?????{ 

??????? { 

????????? { 

??????????? type dataMode :  

??????????? { 

????????????? application t38fax :  

????????????? { 

??????????????? t38FaxProtocol udp : NULL 

??????????????? t38FaxProfile  

??????????? ????{ 

????????????????? fillBitRemoval FALSE 

????????????????? transcodingJBIG FALSE 

????????????????? transcodingMMR FALSE 

????????????????? version 0 

????????????????? t38FaxRateManagement transferredTCF : NULL 

????????????????? t38FaxUdpOptions  

?????? ???????????{ 

??????????????????? t38FaxMaxBuffer 200 

??????????????????? t38FaxMaxDatagram 72 

??????????????????? t38FaxUdpEC t38UDPRedundancy : NULL 

????????????????? } 

??????????????? } 

????????????? } 

????????????? bitRate 144 

??????????? } 

????????? } 

??????? } 

????? } 

??? } 

May 3 21:41:26.753: changing from H245_MR_NONE state to H245_MR_WAIT_FOR_ACK state 

May 3 21:41:26.861: vtsp_process_dsp_message: 
   MSG_TX_TONE_DETECT: type=0 trigger=0 tone_id=0 

May 3 21:41:26.861: vtsp:[1:D (10), S_LFAX_WAIT_CAPS_ACK, E_DSP_TONE_DETECT] 

May 3 21:41:26.865: vtsp_process_event(): prev_state = 0.11 , 

state = S_LFAX_WAIT_CAPS_ACK, event = E_DSP_TONE_DETECT  

?Invalid FSM? Input on channel 1:D (10)h323chan_chn_process_read_socket:
fd (3) of type ACCEPTED has data PROCESS_READ: NOT COMPLETE, rc 10, fd=3 

May? 3 21:41:27.001: vtsp_process_dsp_message: 
   MSG_TX_TONE_DETECT: type=0 trigger=1 tone_id=0 

May? 3 21:41:27.001: vtsp:[1:D (10), S_LFAX_WAIT_CAPS_ACK, E_DSP_TONE_DETECT] 

May? 3 21:41:27.005: vtsp_process_event(): prev_state = 0.11 , 

?state = S_LFAX_WAIT_CAPS_ACK, event = E_DSP_TONE_DETECT  

Invalid FSM?Input on channel 1:D (10) 

May 3 21:41:27.101: vtsp_process_dsp_message: 
   MSG_TX_TONE_DETECT: type=0 trigger=0 tone_id=0 

May 3 21:41:27.101: vtsp:[1:D (10), S_LFAX_WAIT_CAPS_ACK, E_DSP_TONE_DETECT] 

May 3 21:41:27.105: vtsp_process_event(): prev_state = 0.11 , 

state = S_LFAX_WAIT_CAPS_ACK, event = E_DSP_TONE_DETECT  

Invalid FSM Input on channel 1:D (10)h323chan_chn_process_read_socket: 
   fd (3) of type ACCEPTED has data 

Hex representation of the received TPKT0321000827000100 

May 3 21:41:27.173: ? state = 0 bytesLeftToDecode = 4 

May 3 21:41:27.173: H245 MSC INCOMING ENCODE BUFFER::= 27 000100 

!---Received ModeRequestAck from the OGW:
 
May 3 21:41:27.173: H245 MSC INCOMING PDU ::= 

value MultimediaSystemControlMessage ::= response : requestModeAck :  

??? { 

????? sequenceNumber 1 

????? response willTransmitMostPreferredMode : NULL 

??? } 

Set new event H245_EVENT_MR_CFM, for callID 9 

May 3 21:41:27.173: cch323_run_h245_mr_sm: received event 
   H245_EVENT_MR_CFM while at state H245_MR_WAIT_FOR_ACK

!---The voice LC is closed and the T.38 fax data LC is opened:
 
May 3 21:41:27.173: H245 MSC OUTGOING PDU ::= 

value MultimediaSystemControlMessage ::= request : closeLogicalChannel :?
 
!---In the previous line, 
   LogicalChannel refers to the voice LC.
 
??? { 

????? forwardLogicalChannelNumber 1

????? source user : NULL 

??? } 

May 3 21:41:27.173: H245 MSC OUTGOING ENCODE BUFFER::= 04 00000000  

May 3 21:41:27.173: send result :0  

May 3 21:41:27.173: changing from H245_OLC_DONE state to H245_OLC_NONE state 

May 3 21:41:27.173: cch323_update_new_codec_info: Remote codec 17 

May 3 21:41:27.173: cch323_update_new_codec_info: negotiated_codec set(17)(40 bytes) 

May 3 21:41:27.173: Changing to new event H245_EVENT_OLC 

May 3 21:41:27.177: cch323_h245_olc_sm: 
   received event H245_EVENT_OLC while at state H245_OLC_NONE 

May 3 21:41:27.177: changing from H245_OLC_NONE state to H245_OLC_WAIT state 

May 3 21:41:27.177: H245 MSC OUTGOING PDU ::= 

value MultimediaSystemControlMessage ::= request : openLogicalChannel :?
 
!---In the previous line, 
   LogicalChannel refers to the T.38 or data LC.

??? { 

????? forwardLogicalChannelNumber 2 

????? forwardLogicalChannelParameters  

????? { 

??????? dataType data :  

??????? { 

????????? application t38fax :  

????????? { 

??????????? t38FaxProtocol udp : NULL 

??????????? t38FaxProfile  

??????????? { 

????????????? fillBitRemoval FALSE 

????????????? transcodingJBIG FALSE 

????????????? transcodingMMR FALSE 

????????????? version 0 

????????????? t38FaxRateManagement transferredTCF : NULL 

????????????? t38FaxUdpOptions  

??????????? ??{ 

??????????????? t38FaxMaxBuffer 200 

??????????????? t38FaxMaxDatagram 72 

??????????????? t38FaxUdpEC t38UDPRedundancy : NULL 

????????????? } 

??????????? } 

????????? } 

????????? maxBitRate 144 

??????? } 

??????? multiplexParameters h2250LogicalChannelParameters :  

??????? { 

????????? sessionID 3?


!---The previous line refers to the data session ID.
 
????????? mediaControlChannel unicastAddress : iPAddress :  

????????? { 

??????????? network 'AB44BA66'H 

??????????? tsapIdentifier 17517 

????????? } 

????????? silenceSuppression FALSE 

??????? } 

????? } 

??? } 

May 3 21:41:27.181: H245 MSC OUTGOING ENCODE BUFFER::=
03 00000111 04118601 00805C01 00014007 C00200C8 
   01484000 90800B05 000300AB 44BA6644 6D00 

May 3 21:41:27.181: send result :0  

May 3 21:41:27.181: OLC using T38Fax 

May 3 21:41:27.181: changing from H245_MR_WAIT_FOR_ACK state to H245_MR_NONE state 

h323chan_chn_process_read_socket: fd (3) of type ACCEPTED has data 

Hex representation of the received TPKT032100090400000000 

May 3 21:41:27.185: ? state = 0 bytesLeftToDecode = 5 

May 3 21:41:27.185: H245 MSC INCOMING ENCODE BUFFER::= 04 00000000  

May 3 21:41:27.185:  

May 3 21:41:27.185: H245 MSC INCOMING PDU ::= 

value MultimediaSystemControlMessage ::= request : closeLogicalChannel :?? 

!---In the previous line, 
   LogicalChannel refers to the voice LC.
 
??? { 

????? forwardLogicalChannelNumber 1 

????? source user : NULL 

??? } 

May? 3 21:41:27.185: H245 MSC OUTGOING PDU ::= 

value MultimediaSystemControlMessage ::= response 
: closeLogicalChannelAck :???
 
!---In the previous line, 
   LogicalChannel refers to the voice LC.
 
??? { 

????? forwardLogicalChannelNumber 1 

??? } 

May 3 21:41:27.185: H245 MSC OUTGOING ENCODE BUFFER::= 23 800000 

May 3 21:41:27.185: H245 MSC INCOMING ENCODE BUFFER::=
03 00000111 04118601 00805C01 00014007 
   C00200C8 01484000 90800B05 000300AC 10AF6941 7100 

May 3 21:41:27.189: H245 MSC INCOMING PDU ::= 

value MultimediaSystemControlMessage ::= request : openLogicalChannel :? 

!---In the previous line, 
   LogicalChannel refers to the T.38 or data LC.
 

??? { 

????? forwardLogicalChannelNumber 2 

????? forwardLogicalChannelParameters  

????? { 

??????? dataType data :  

??????? { 

????????? application t38fax :  

????????? { 

??????????? t38FaxProtocol udp : NULL 

??????????? t38FaxProfile  

??????????? { 

????????????? fillBitRemoval FALSE 

????????????? transcodingJBIG FALSE 

????????????? transcodingMMR FALSE 

????????????? version 0 

????????????? t38FaxRateManagement transferredTCF : NULL 

????????????? t38FaxUdpOptions  

????????????? { 

??????????????? t38FaxMaxBuffer 200 

??????????????? t38FaxMaxDatagram 72 

??????????????? t38FaxUdpEC t38UDPRedundancy : NULL 

????????????? } 

??????????? } 

????????? } 

????????? maxBitRate 144 

??????? } 

??????? multiplexParameters h2250LogicalChannelParameters :  

??????? { 

????????? sessionID 3 

????????? mediaControlChannel unicastAddress : iPAddress :  

????????? { 

??????????? network 'AC10AF69'H 

??????????? tsapIdentifier 16753 

????????? } 

????????? silenceSuppression FALSE 

???? ???} 

????? } 

??? } 

!---DSP started T.38 fax codec download:
 
May 3 21:41:27.193: cc_api_t38_fax_start 
   (dstVdbPtr=0x624130C0, dstCallId=0xA, srcCallId=0x9, 

???? caps={codec=0x10000, fax_rate=0x2, vad=0x2, modem=0x 
   codec_bytes=160, signal_type=1}) 

May 3 21:41:27.193: vtsp:[1:D (10), S_LFAX_WAIT_CAPS_ACK, E_CC_T38_START] 

May 3 21:41:27.193: act_caps_ack_lfax_dnld 

May 3 21:41:27.193: vtsp_timer_stop: 2016700 

May 3 21:41:27.193: dsp_idle_mode: [1:D (10)] 
   packet_len=8 channel_id=8481 packet_id=68 

May 3 21:41:27.193: cc_api_local_codec_dnld_done 
(dstVdbPtr=0x61B45A90, dstCallId=0x9, srcCallId=0xA) 

May 3 21:41:27.193: vtsp_timer: 2016700cch323_h245_local_codec_dnld_done: 
   negotiatedCodec[17]  

May 3 21:41:27.197: Changing to new event H245_EVENT_OLC_IND 

May 3 21:41:27.197: cch323_h245_olc_sm: 
   received event H245_EVENT_OLC_IND while at state H245_OLC_WAIT 

May 3 21:41:27.197: H245 MSC OUTGOING PDU ::= 

value MultimediaSystemControlMessage ::= response 
   : openLogicalChannelAck :  

??? { 

????? forwardLogicalChannelNumber 2 

????? forwardMultiplexAckParameters h2250LogicalChannelAckParameters :  

????? { 

??????? sessionID 1 

??????? mediaChannel unicastAddress : iPAddress :  

??????? { 

????????? network 'AB44BA66'H 

????????? tsapIdentifier 17516 

??????? } 

????? ??mediaControlChannel unicastAddress : iPAddress :  

??????? { 

????????? network 'AB44BA66'H 

????????? tsapIdentifier 17517 

??????? } 

??????? flowControlToZero FALSE 

????? } 

??? } 

May 3 21:41:27.197: H245 MSC OUTGOING ENCODE BUFFER:
:= 22 C0000104 80145C00 00AB44BA 66446C00 AB44BA66 446D0300 0100 

May 3 21:41:27.589: ? state = 0 bytesLeftToDecode = 4 

May 3 21:41:27.589: H245 MSC INCOMING ENCODE BUFFER::= 23 800000 

May 3 21:41:27.589:  

May 3 21:41:27.589: H245 MSC INCOMING PDU ::= 

value MultimediaSystemControlMessage ::= response : closeLogicalChannelAck :  

??? { 

????? forwardLogicalChannelNumber 1 

??? } 

May 3 21:41:27.789: H245 MSC INCOMING ENCODE BUFFER:
:= 22 C0000104 80145C00 00AC10AF 69417000 AC10AF69 41710300 0100 

May 3 21:41:27.789: H245 MSC INCOMING PDU ::= 

value MultimediaSystemControlMessage ::= response : openLogicalChannelAck :  

??? { 

????? forwardLogicalChannelNumber 2 

????? forwardMultiplexAckParameters h2250LogicalChannelAckParameters :  

????? { 

??????? sessionID 3 

??????? mediaChannel unicastAddress : iPAddress :  

??????? { 

????????? network 'AC10AF69'H 

????????? tsapIdentifier 16752 

??????? } 

??????? mediaControlChannel unicastAddress : iPAddress :  

??????? { 

????????? network 'AC10AF69'H 

????????? tsapIdentifier 16753 

??????? } 

??????? flowControlToZero FALSE 

????? } 

??? } 

May 3 21:41:27.793: Changing to new event H245_EVENT_OLC_CFM 

May 3 21:41:27.793: cch323_h245_olc_sm: 
   received event H245_EVENT_OLC_CFM while at state H245_OLC_WAIT 

May 3 21:41:27.793: changing from H245_OLC_WAIT state to H245_OLC_DONE state 

May 3 21:41:27.793: cc_api_t38_fax_start 
   (dstVdbPtr=0x624130C0, dstCallId=0xA, srcCallId=0x9, 

???? caps={codec=0x10000, fax_rate=0x2, vad=0x2, 
   modem=0x0 codec_bytes=160, signal_type=1}) 

May 3 21:41:27.793: H.225 SM: process event H225_EVENT_H245_SUCCESS, for callID 9 

May 3 21:41:27.793: cch323_run_h225_sm: 
   received event H225_EVENT_H245_SUCCESS while at state H225_ACTIVE 

May 3 21:41:27.793: cc_api_remote_codec_dnld_done 
   (dstVdbPtr=0x624130C0, dstCallId=0xA, srcCallId=0x9) 

May 3 21:41:27.793: vtsp:[1:D (10), S_LFAX_WAIT_FAX, E_CC_T38_START] 

May 3 21:41:27.793: vtsp:[1:D (10), S_LFAX_WAIT_FAX, E_CC_T30_CAP_ACK] 

May 3 21:41:27.793: act_t38_lfax_mode  

May 3 21:41:27.793: vtsp_timer_stop: 2016760 

May 3 21:41:27.793: cc_api_set_fax_mode 
   (dstVdbPtr=0x61B45A90, dstCallId=0x9, srcCallId=0xA) 

May 3 21:41:27.793: dsp_idle_mode: [1:D (10)] 
   packet_len=8 channel_id=8481 packet_id=68 

May 3 21:41:27.793: dsp_encap_config: T38 

May 3 21:41:27.793: dsp_fax_mode: [1:D (10)] FaxRate 0x2, Codec 0x10000? 
dsp_fax_mode() ECM_DISABLE not set,
debug_info not requested  

May 3 21:41:27.793: dsp_fax_mode:[1:D (10)] 
   packet_len=28 channel_id=8481 packet_id=69 max_trans=6 info_size=20,
fax_protocol_type=3,hs_data_len=40, ls_data_red=0, hs_data_red=0, 
   tcf_handling=2, fax_relay_cntl=0x0 nsf_country = 0xAD, nsf_mfg = 0x0051 

May 3 21:41:29.621: ccGetCallActive 
   (next=1, setup_time=0x0, index=0x0, p=0x6293A8C0) 

May 3 21:41:29.621: ccGetCallActive 
   (next=1, setup_time=0x1EC241, index=0x1, p=0x6293A8C0)

Um exemplo de um atendimento falhado de T.38

Este é um exemplo do comando debug para um atendimento falhado de T.38:

saída do comando debug vtsp all

!---When the ModeRequest was sent, 
   T35 nonStandard was sent instead of T38:

*Jun 14 15:35:01.743: PDU DATA = 61593960 

value MultimediaSystemControlMessage ::= request : requestMode : 

??? { 

????? sequenceNumber 12 

????? requestedModes 

????? { 

??????? { 

????????? { 

??????????? type dataMode : 

??????????? { 

????????????? application nonStandard : 

????????????? { 

??????????????? nonStandardIdentifier h221NonStandard : 

??????????????? { 

????????????????? t35CountryCode 181

? ????????????????t35Extension 0 

????????????????? manufacturerCode 20 

??????????????? } 

??????????????? data '543338466178554450'H 

????????????? } 

????????????? bitRate 144 

??????????? } 

????????? } 

??????? } 

????? } 

??? } 

Set new event H245_EVENT_MR_IND, for callID C 

*Jun 14 15:35:01.751: cch323_run_h245_mr_sm: received event H245_EVENT_MR_IND wh 

ile at state H245_MR_NONE 

*Jun 14 15:35:01.751: Scan Preferred List for g729r8PDU DATA = 61593960 

value MultimediaSystemControlMessage ::= response : requestModeAck : 

??? { 

????? sequenceNumber 12 

????? response willTransmitMostPreferredMode : NULL 

??? } 

RAW_BUFFER::= 

27 000C00 

*Jun 14 15:35:01.751: PDU DATA = 61593960 

value MultimediaSystemControlMessage ::= request : closeLogicalChannel : 

??? { 

?? ???forwardLogicalChannelNumber 2 

????? source user : NULL 

??? } 

RAW_BUFFER::= 

04 00000100 

*Jun 14 15:35:01.751: 

*Jun 14 15:35:01.751: changing from H245_OLC_DONE state to H245_OLC_NONE state 

*Jun 14 15:35:01.751: cch323_update_new_codec_info: Remote codec 17 

*Jun 14 15:35:01.751: cch323_update_new_codec_info: negotiated_codec set(17)(40 

bytes) 

*Jun 14 15:35:01.751: Changing to new event H245_EVENT_OLC 

*Jun 14 15:35:01.751: cch323_h245_olc_sm: 
   received event H245_EVENT_OLC while atstate H245_OLC_NONE 

*Jun 14 15:35:01.751: changing from H245_OLC_NONE state to H245_OLC_WAIT state 

PDU DATA = 61593960 

value MultimediaSystemControlMessage ::= request : openLogicalChannel : 

??? { 

????? forwardLogicalChannelNumber 3 

????? forwardLogicalChannelParameters 

????? { 

??????? dataType data : 

??????? { 

????????? application nonStandard : 

????????? { 

??????????? nonStandardIdentifier h221nonStandard : 

??????????? { 

????????????? t35CountryCode 181 

????????????? t35Extension 0 

????????????? manufacturerCode 18 

? ??????????} 

??????????? data '543338466178554450'H 

????????? } 

????????? maxBitRate 144 

??????? } 

??????? multiplexParameters h2250LogicalChannelParameters : 

??????? { 

????????? sessionID 3 

????????? mediaControlChannel unicastAddress : iPAddress : 

?????? ???{ 

??????????? network 'C95C381E'H 

??????????? tsapIdentifier 18101 

????????? } 

??????? } 

????? } 

??? } 

RAW_BUFFER::= 

03 00000210 08B50000 12095433 38466178 55445000 90800A04 000300C9 5C381E46 B5 

*Jun 14 15:35:01.759: 

*Jun 14 15:35:01.759: OLC using T38Fax 

*Jun 14 15:35:01.783: Changing to new event H245_PROCESS_H245CONTROL 

*Jun 14 15:35:01.783: cch323_h245_connection_sm:H245_CONNECT: received event H24 

5_PROCESS_H245CONTROL while at H245_CONNECTED state 

RAW_BUFFER::= 

04 80000100 800100 

*Jun 14 15:35:01.783: PDU DATA = 61593960 

value MultimediaSystemControlMessage ::= request : closeLogicalChannel : 

??? { 

????? forwardLogicalChannelNumber 2 

????? source user : NULL 

????? reason unknown : NULL 

??? } 

PDU DATA = 61593960 

value MultimediaSystemControlMessage ::= response : closeLogicalChannelAck : 

??? { 

????? forwardLogicalChannelNumber 2 

??? } 

RAW_BUFFER::= 

23 800001 

*Jun 14 15:35:01.787: 

*Jun 14 15:35:01.787: Changing to new event H245_PROCESS_H245CONTROL 

*Jun 14 15:35:01.787: cch323_h245_connection_sm:H245_CONNECT: received event H24 

5_PROCESS_H245CONTROL while at H245_CONNECTED state 

RAW_BUFFER::= 

03 00000310 08B50000 14095433 38466178 55445000 90800300 0003 

*Jun 14 15:35:01.787: PDU DATA = 61593960 

value MultimediaSystemControlMessage ::= request : openLogicalChannel : 

??? { 

????? forwardLogicalChannelNumber 4 

????? forwardLogicalChannelParameters 

????? { 

??????? dataType data : 

??????? { 

????????? application nonStandard : 

????????? { 

??????????? nonStandardIdentifier h221NonStandard : 

?? ?????????{ 

????????????? t35CountryCode 181 

????????????? t35Extension 0 

????????????? manufacturerCode 20 

??????????? } 

??????????? data '543338466178554450'H 

????????? } 

????????? maxBitRate 144 

??????? } 

??????? multiplexParameters h2250LogicalChannelParameters : 

??????? { 

????????? sessionID 3 

??????? } 

????? } 

??? } 

*Jun 14 15:35:01.831: Changing to new event H245_PROCESS_H245CONTROL 

*Jun 14 15:35:01.831: cch323_h245_connection_sm:H245_CONNECT: received event H24 

5_PROCESS_H245CONTROL while at H245_CONNECTED state 

RAW_BUFFER::= 

23 800001 

*Jun 14 15:35:01.831: PDU DATA = 61593960 

value MultimediaSystemControlMessage ::= response : closeLogicalChannelAck : 

??? { 

????? forwardLogicalChannelNumber 2 

??? } 

*Jun 14 15:35:01.883: Changing to new event H245_PROCESS_H245CONTROL 

*Jun 14 15:35:01.883: cch323_h245_connection_sm:H245_CONNECT: received event H24 

5_PROCESS_H245CONTROL while at H245_CONNECTED state 

RAW_BUFFER::= 

22 C0000204 800C5804 00875C34 CB1B4801 0100 

*Jun 14 15:35:01.883: PDU DATA = 61593960 

value MultimediaSystemControlMessage ::= response : openLogicalChannelAck : 

??? { 

????? forwardLogicalChannelNumber 3 

????? forwardMultiplexAckParameters h2250LogicalChannelAckParameters : 

????? { 

??????? sessionID 3 

??????? mediaChannel unicastAddress : iPAddress : 

??????? { 

????????? network '875C34CB'H 

????????? tsapIdentifier 6984 

??????? } 

??????? flowControlToZero FALSE 

????? } 

??? } 

*Jun 14 15:35:01.887: Changing to new event H245_EVENT_OLC_CFM 

*Jun 14 15:35:01.887: cch323_h245_olc_sm: 
   received event H245_EVENT_OLC_CFM while at state H245_OLC_WAIT 

*Jun 14 15:35:01.887: changing from H245_OLC_WAIT state to H245_OLC_DONE state 

cch323_h245_local_codec_dnld_done: negotiatedCodec[17] 

*Jun 14 15:35:01.979: Changing to new event H245_EVENT_OLC_IND 

*Jun 14 15:35:01.979: cch323_h245_olc_sm: received event H245_EVENT_OLC_IND whil 

e at state H245_OLC_DONE 

!---Session ID was sent as voice session ID, 
   fallback to voice and the call disconnected:
 
PDU DATA = 61593960 

value MultimediaSystemControlMessage ::= response : openLogicalChannelAck : 

??? { 

????? forwardLogicalChannelNumber 4 

????? forwardMultiplexAckParameters h2250LogicalChannelAckParameters : 

????? { 

??????? sessionID 1 

??????? mediaChannel unicastAddress : iPAddress : 

??????? { 

??? ??????network 'C95C381E'H 

????????? tsapIdentifier 18100 

??????? } 

??????? mediaControlChannel unicastAddress : iPAddress : 

??????? { 

????????? network 'C95C381E'H 

????????? tsapIdentifier 18101 

??????? } 

??????? flowControlToZero FALSE 

????? } 

??? } 

RAW_BUFFER::= 

22 C0000304 80145C00 00C95C38 1E46B400 C95C381E 46B50300 0100 

*Jun 14 15:35:01.983:

Esta seção detalha a anatomia de um fax bem sucedido de T.38 setup entre um roteador do AS5300 Series e um Modular Access Router do Cisco 3640. As saídas do comando debug and show foram capturadas no comando debug vtsp all em um Modular Access Router do Cisco 3640 como o TGW IO 12.4:

saída do comando debug vtsp all
Router# debug vtsp all

Voice telephony call control all debugging is on

!--- At this point, the VTSP is not aware of anything. 
The format of this message is 
//callid/GUID/VTSP:(voice-port):T1-channel_number:DSP_number:DSP_channel_number: 

•CallEntry ID is -1. 

•GUID is xxxxxxxxxx. 

•The voice port is blank. 

•Channel ID is -1. 

•DSP ID is -1. 

•DSP channel ID is -1. 



*Mar  1 08:23:10.869: //-1/xxxxxxxxxxxx/VTSP:():-1:-1:-1/vtsp_do_regxrule_translate: 


!--- The original and the translated calling number are the same 
   (55555) and the original and the translated called number are the same (888545). 
   These numbers are often the same because if a translation rule is applied, 
   it will be on the dial peers or the ports, both of which comes later than these 
   VTSP messages in the Cisco IOS code execution. 


*Mar  1 08:23:10.869: //-1/xxxxxxxxxxxx/VTSP:():-1:-1:-1/vtsp
   _do_regxrule_translate: 
calling_number(original)= calling_number(xlated)=55555 called_number(original)= 
called_number(xlated)=888545 redirectNumber(original)= redirectNumber(xlated)=


!--- The VTSP got a call setup indicator from the TSP layer 
   with called number 888545 and calling number 55555. There is no awareness 
   of the CallEntry ID (-1) or the GUID (xxxxxxxxxxxx). 

   *Mar  1 08:23:10.873: //-1/xxxxxxxxxxxx/VTSP:():-1:-1:-1/vtsp_tsp_call_setup_ind: 
(sdb=0x634C90EC, tdm_info=0x0, tsp_info=0x63083950, 
   calling_number=55555 calling_oct3 = 0x80, called_number=888545 called_oct3 = 0x80, 
   oct3a=0x0): peer_tag=10002

*Mar  1 08:23:10.873: //-1/xxxxxxxxxxxx/VTSP:():-1:-1:-1/vtsp_tsp_fill_setup_ind

: ev.clg.clir is 0

 ev.clg.clid_transparent is 0

 ev.clg.null_orig_clg is 0

 ev.clg.calling_translated is false


*Mar  1 08:23:10.873: //-1/xxxxxxxxxxxx/VTSP:():-1:-1:-1/vtsp_do_call_setup_ind: .

*Mar  1 08:23:10.873: //-1/xxxxxxxxxxxx/VTSP:():-1:-1:-1/vtsp_allocate_cdb: ,cdb 
0x635FC480

*Mar  1 08:23:10.873: //-1/xxxxxxxxxxxx/VTSP:():-1:-1:-1/vtsp_do_call_setup_ind:

*Mar  1 08:23:10.873:  source route label


!--- At this point, the VTSP is not aware of anything. 
   The format of this message is 
//callid/GUID/VTSP:(voice-port):T1-channel_number:DSP_number:DSP_channel_number: 

•CallEntry ID is -1. 

•GUID is D2F6429A8A8A. 

•The voice port is 1/0:23 where 23 indicates D channel. 

•The T1 channel is still unknown at this point (-1). 

•The digital signal processor (DSP) is 0. 

•The DSP channel is 4. 


*Mar  1 08:23:10.873: //-1/D2F6429A8A8A/VTSP:(1/0:23):-1:0:4/vtsp_do_call_setup_

ind: Call ID=101002, guid=635FCB08

!--- The VTSP learns about the B channel (changed from -1 to 22), 
   and the CallEntry ID is still unknown (-1). 


*Mar  1 08:23:10.873: //-1/D2F6429A8A8A/VTSP:
   (1/0:23):22:0:4/vtsp_do_call_setup_ind: 
type=0, under_spec=1615186336, name=, id0=23, id1=0, id2=0, calling=55555,called=888545 
subscriber=RegularLinevtsp_do_call_setup_ind: redirect DN =  reason = -1

*Mar  1 08:23:10.877: //-1/xxxxxxxxxxxx/VTSP:():-1:-1:-1/vtsp_do_normal_call_setup_ind: .


!--- The VTSP learns the CallEntry ID. The format of this message is 
//callid/GUID/VTSP:(voice-port):T1-channel_number:DSP_number:DSP_channel_number: 

•CallEntry ID is 899 (changed from -1 to 899) 

•GUID is D2F6429A8A8A 

•The voice port is 1/0:23 where 23 indicates D channel 

•The T1 channel is 22 

•The DSP is 12 

•The DSP channel is 4 


*Mar  1 08:23:10.877: //899/D2F6429A8A8A/VTSP:(1/0:23)
   :22:12:4/vtsp_insert_cdb:,cdb 
0x635FC480, CallID=899

*Mar  1 08:23:10.877: 
//899/D2F6429A8A8A/VTSP:(1/0:23):22:12:4/vtsp_open_voice_and_set_params: .


!--- In these outputs, VTSP sets some of the voice 
   parameters for this call: 

•Modem capability 

•Playout delay 

•Dial-peer tag 10003 

•Digit timeouts 


*Mar  1 08:23:10.877: //899/D2F6429A8A8A/VTSP:(1/0:23):
   22:12:4/vtsp_modem_proto_from_cdb: 
cap_modem_proto 0

*Mar  1 08:23:10.881: //899/D2F6429A8A8A/VTSP:(1/0:23):22:12:4/set_playout_cdb:playout 
default

*Mar  1 08:23:10.881: 
//899/D2F6429A8A8A/VTSP:(1/0:23):22:12:4/vtsp_dsp_echo_canceller_control: echo_cancel: 1

*Mar  1 08:23:10.885: //899/D2F6429A8A8A/VTSP:
   (1/0:23):22:12:4/vtsp_save_dialpeer_tag: tag 
= 10003

*Mar  1 08:23:10.885: //899/D2F6429A8A8A/VTSP:
   (1/0:23):22:12:4/vtsp_report_digit_control: 
vtsp_report_digit_control: enable=0:

*Mar  1 08:23:10.885: //899/D2F6429A8A8A/VTSP:(1/0:23):
   22:12:4/vtsp_report_digit_control: 
digit reporting disabled

*Mar  1 08:23:10.885: //899/D2F6429A8A8A/VTSP:(1/0:23):
   22:12:4/vtsp_get_digit_timeouts: : 
vtsp_get_digit_timeouts



!--- VTSP sends out a call-proceeding message to the POTS leg

   *Mar  1 08:23:10.885: 
//899/D2F6429A8A8A/VTSP:(1/0:23):22:12:4/vtsp_process_event:vtsp:[1/0:23:899, 
S_SETUP_INDICATED, E_CC_PROCEEDING]

*Mar  1 08:23:10.885: //899/D2F6429A8A8A/VTSP:(1/0:23):22:12:4/act_proceeding: .

*Mar  1 08:23:10.941: //899/D2F6429A8A8A/VTSP:
   (1/0:23):22:12:4/vtsp_get_dialpeer_tag: tag 
= 10003

*Mar  1 08:23:10.949: //899/D2F6429A8A8A/VTSP:(1/0:23):
   22:12:4/vtsp_get_dialpeer_tag: tag 
= 10003



!--- VTSP sends out an alerting to the POTS leg; 
   the phone is ringing at this time. 


*Mar  1 08:23:10.949: //899/D2F6429A8A8A/VTSP:
   (1/0:23):22:12:4/vtsp_process_event: 
vtsp:[1/0:23:899, S_PROCEEDING, E_CC_ALERT]

*Mar  1 08:23:10.949: //899/D2F6429A8A8A/VTSP:(1/0:23):22:12:4/act_alert: .

*Mar  1 08:23:10.949: //899/D2F6429A8A8A/VTSP:(1/0:23):22:12:4/vtsp_timer_stop:3019095

*Mar  1 08:23:18.769: //899/D2F6429A8A8A/VTSP:(1/0:23):
   22:12:4/vtsp_get_dialpeer_tag: tag 
= 10003


!--- The phone gets answered here, 
   a bridge is now set up between the two call legs. 



*Mar  1 08:23:10.949: //899/D2F6429A8A8A/VTSP:
   (1/0:23):22:12:4/vtsp_process_event: 
vtsp:[1/0:23:899, S_PROCEEDING, E_CC_ALERT]

*Mar  1 08:23:10.949: //899/D2F6429A8A8A/VTSP:(1/0:23):22:12:4/act_alert: .

*Mar  1 08:23:10.949: //899/D2F6429A8A8A/VTSP:(1/0:23):22:12:4/vtsp_timer_stop:3019095

*Mar  1 08:23:18.769: //899/D2F6429A8A8A/VTSP:(1/0:23):
   22:12:4/vtsp_get_dialpeer_tag: tag 
= 10003


!--- The call is now connected. 



Mar  1 08:23:18.769: //899/D2F6429A8A8A/VTSP:(1/0:23)
   :22:12:4/vtsp_process_event: 
vtsp:[1/0:23:899, S_ALERTING, E_CC_CONNECT]

*Mar  1 08:23:18.769: //899/D2F6429A8A8A/VTSP:(1/0:23):22:12:4/act_alert_connect: .

*Mar  1 08:23:18.773: //899/D2F6429A8A8A/VTSP:(1/0:23):22:12:4/vtsp_ring_noan_timer_stop: 
3019877


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Document ID: 22853