CUCM和VCS在呼叫的体验单向音频在他们之间

简介

本文描述如何排除故障呼叫的单向音频问题在视频通信服务器(VCS)和Cisco Unified Communications Manager (CUCM)之间。

问题

象这样的一呼叫，终端1-----H323----VCS----SIP----CUCM---Endpoint 2，也许导致终端1听不到终端2.的单向音频。

这是从VCS的日志分析。

VCS发送200 OK给CallManager ：

2014-01-23T12:40:10+11:00 vcs-cont-pro-1 tvcs: UTCTime="2014-01-23 01:40:10,296"
Module="network.sip" Level="DEBUG": Dst-ip="10.69.12.2" Dst-port="60493"
 SIPMSG:
 |SIP/2.0 200 OK
 Via: SIP/2.0/TCP 10.69.12.2:5060;branch=z9hG4bK2359e3e241306;received=
10.69.12.2;ingress-zone=CUCMNeighbour
 Call-ID: 8935a699d9e9e3f8@127.0.0.1
 CSeq: 102 INVITE
 Contact: <sip:AVS.EX60.-.Elliott@172.17.254.1>
 From: <sip:00419241145@10.69.11.1:5060>;tag=6417ce1c-8b93-4ba0-859a-ad892a39
e373-92748854
 To: <sip:AVS.EX60.-.Elliott@172.17.254.1>;tag=27b6f95b717b59fc
v=0
 o=tandberg 0 3 IN IP4 127.0.0.1
 s=-
 c=IN IP4 172.17.254.1
 b=AS:512
 t=0 0
 m=audio 51390 RTP/AVP 0 101
 b=TIAS:64000
 a=rtpmap:0 PCMU/8000
 a=rtpmap:101 telephone-event/8000
 a=fmtp:101 0-15
 a=sendrecv
 a=rtcp:51391 IN IP4 172.17.254.1

在MasterSlaveDetermination前， VCS设法发送OpenLogicalChannel (OLC)到终端，导致OLC的终端拒绝：

2014-01-23T12:40:10+11:00 vcs-cont-pro-1 tvcs: UTCTime="2014-01-23 01:40:10,366"
Module="network.h323" Level="DEBUG": Dst-ip="172.19.83.180" Dst-port="11158"
 Sending H.245 PDU:
 value MultimediaSystemControlMessage ::= request : openLogicalChannel :
 {
 forwardLogicalChannelNumber 1,
 forwardLogicalChannelParameters
 {
 dataType audioData : g711Ulaw64k : 40,
 multiplexParameters h2250LogicalChannelParameters :
 {
 sessionID 1,
 mediaControlChannel unicastAddress : iPAddress :
 {
 network 'AC11FE01'H,
 tsapIdentifier 51669
 },
 transportCapability
 {
 mediaChannelCapabilities
 {
{
 mediaTransport ip-UDP : NULL
 }
 }
 }
 }
 }
 }

这是从终端的MasterSlaveDetermination ：

2014-01-23T12:40:10+11:00 vcs-cont-pro-1 tvcs: UTCTime="2014-01-23 01:40:10,475"
Module="network.h323" Level="INFO": Src-ip="172.19.83.180" Src-port="11158"
 Detail="Received H.245 MasterSlaveDeterminationRequest "
2014-01-23T12:40:10+11:00 vcs-cont-pro-1 tvcs: UTCTime="2014-01-23 01:40:10,475"
Module="network.h323" Level="DEBUG": Src-ip="172.19.83.180" Src-port="11158"
 Received H.245 PDU:
 value MultimediaSystemControlMessage ::= request : masterSlaveDetermination :
 {
 terminalType 190,
 statusDeterminationNumber 8028716
 }

这是MasterSlaveDeterminationAck对终端：

2014-01-23T12:40:10+11:00 vcs-cont-pro-1 tvcs: UTCTime="2014-01-23 01:40:10,475"
Module="network.h323" Level="INFO": Dst-ip="172.19.83.180" Dst-port="11158"
 Detail="Sending H.245 MasterSlaveDeterminationAckResponse Master"
2014-01-23T12:40:10+11:00 vcs-cont-pro-1 tvcs: UTCTime="2014-01-23 01:40:10,475"
Module="network.h323" Level="DEBUG": Dst-ip="172.19.83.180" Dst-port="11158"
 Sending H.245 PDU:
 value MultimediaSystemControlMessage ::= response : masterSlaveDeterminationAck :
 {
 decision master : NULL
 }

因为OLC在MasterSlaveDetermination前，进来OLC的终端的拒绝导致单向音频。

2014-01-23T12:40:10+11:00 vcs-cont-pro-1 tvcs: UTCTime="2014-01-23 01:40:10,519"
Module="network.h323" Level="INFO": Src-ip="172.19.83.180" Src-port="11158"
 Detail="Received H.245 OpenLogicalChannelRejResponse "
2014-01-23T12:40:10+11:00 vcs-cont-pro-1 tvcs: UTCTime="2014-01-23 01:40:10,519"
Module="network.h323" Level="DEBUG": Src-ip="172.19.83.180" Src-port="11158"
 Received H.245 PDU:
 value MultimediaSystemControlMessage ::= response : openLogicalChannelReject :
 {
 forwardLogicalChannelNumber 1,
 cause masterSlaveConflict : NULL
 }

解决方案

此问题是由Cisco Bug ID CSCuc98144引起的，并且修正是启用允许空邀请在CUCM区域的VCS区域配置文件。这强制VCS派出初始邀请与预先配置的会话描述协议(SDP)，允许呼叫连接在两个方向的音频。

在VCS配置下- >区域- >区域，挑选CUCM区域，和更改在此屏幕画面指示的字段：

其它选项是升级VCS对问题是解决的版本X8.1.1。

注意：这只是一个原因呼叫也许有单向音频。