隧道Q信令(QSIG)数据导致出站代理在18分钟内未就绪

简介

本文档介绍在网关未检测到应答机终止音后发送Bye消息时，Cisco Unified Contact Center Enterprise(UCCE)环境中的会话发起协议(SIP)拨号器的行为。

问题：隧道Q信令(QSIG)数据导致出站代理在18分钟内未就绪

UCCE版本10.x

呼叫流:     PSTN <— QSIG — 网关<— SIP — 拨号器

拨号程序配置：  转接到IVR路由点和终止音检测已勾选

当网关检测到应答机但未确定应答机终止音时，它向SIP拨号器发送Bye消息。  SIP拨号程序回送“SIP/2.0 415 Unsupported Media Type”。 在这种情况下，呼叫无法终止，并且座席在大约18分钟内无法返回到就绪状态。

当网关发送带AsmT（应答机终止音）的CPA时，呼叫可以参考到VRU支路。

<无AsmT>

<使用AsmT>

解决方案

分析:

sip消息中封装的QSIG消息包含多部分MiME正文。

Multipart-MIME正文 — 包含隧道QSIG数据的消息部分。

在SIP TDM网关场景中，有两个选项 — 原始消息(rawmsg)和无条件。rawmsg选项指定仅原始消息（application/qsig或application/x-q931）的隧道。 无条件选项指定所有其他消息主体的隧道，例如GTD和原始消息（application/qsig或application/x-q931）。


如果用户代理服务器(UAS)无法处理隧道QSIG或Q.931消息，您应该会收到SIP 415最终响应消息（不支持的媒体类型）

http://www.cisco.com/c/en/us/td/docs/ios/voice/cube/configuration/guide/vb_book/vb_book/vb_8377.html

已从Bye消息(GW —> Dialer)中看到多部分MIME正文：

13:46:21:865 dialer-baDialer Trace: (RESIP) Received an unsupported mime type: multipart/mixed;boundary=uniqueBoundary for SipReq:  BYE 10000@10.240.112.25:58800 cid=875d601c-803f1b7c-0f42dd21-1739f77c tid=5A5EF5141D cseq=BYE / 103 from(wire). 
13:46:21:865 dialer-baDialer Trace: (RESIP) Helper::makeResponse(SipReq:  BYE 10000@10.240.112.25:58800 cid=875d601c-803f1b7c-0f42dd21-1739f77c tid=5A5EF5141D cseq=BYE / 103 from(wire) code=415 reason=. 
13:46:21:865 dialer-baDialer Trace: (RESIP) SEND: SipResp: 415 cid=875d601c-803f1b7c-0f42dd21-1739f77c tid=5A5EF5141D cseq=BYE / 103 from(tu). 
13:46:21:865 dialer-baDialer Trace: (RESIP) Failed content validation BYE sip:10000@10.240.112.25:58800 SIP/2.0
Via: SIP/2.0/UDP 10.240.112.248:5060;branch=z9hG4bK5A5EF5141D
Max-Forwards: 70
To: <sip:10000@10.240.112.25>;tag=643e4c04
From: <sip:8880411590226@10.240.112.248>;tag=3A39A434-71F
Call-ID: 875d601c-803f1b7c-0f42dd21-1739f77c
CSeq: 103 BYE
Content-Type: multipart/mixed;boundary=uniqueBoundary
Date: Sat, 16 Apr 2016 03:46:10 GMT
MIME-Version: 1.0
Timestamp: 1460778381
User-Agent: Cisco-SIPGateway/IOS-15.4.3.M3
Reason: Q.850;cause=16
Content-Length: 281
P-RTP-Stat: PS=0,OS=0,PR=0,OR=0,PL=0,JI=1,LA=0,DU=11

--uniqueBoundary
Content-Type: application/x-q931
Content-Disposition: signal;handling=optional
Content-Length: 11

--uniqueBoundary
Content-Type: application/gtd
Content-Disposition: signal;handling=optional

REL,
PRN,isdn*,,NET5*,

<Bye message from Gateway >


从拨号程序消息  

13:46:21:865 dialer-baDialer Trace: (RESIP) Received an unsupported mime type: multipart/mixed;boundary=uniqueBoundary for SipReq:  BYE 10000@10.240.112.25:58800 cid=875d601c-803f1b7c-0f42dd21-1739f77c tid=5A5EF5141D cseq=BYE / 103 from(wire). 
13:46:21:865 dialer-baDialer Trace: (RESIP) Helper::makeResponse(SipReq:  BYE 10000@10.240.112.25:58800 cid=875d601c-803f1b7c-0f42dd21-1739f77c tid=5A5EF5141D cseq=BYE / 103 from(wire) code=415 reason=. 
13:46:21:865 dialer-baDialer Trace: (RESIP) SEND: SipResp: 415 cid=875d601c-803f1b7c-0f42dd21-1739f77c tid=5A5EF5141D cseq=BYE / 103 from(tu). 
13:46:21:865 dialer-baDialer Trace: (RESIP) Failed content validation BYE sip:10000@10.240.112.25:58800 SIP/2.0


13:46:21:865 dialer-baDialer Trace: (RESIP) Found matching transaction for SipResp: 415 cid=875d601c-803f1b7c-0f42dd21-1739f77c tid=5A5EF5141D cseq=BYE / 103 from(tu) -> tid=5A5EF5141D [ ServerNonInviteTrying unreliable target=[ V4 10.240.112.248:5060 UDP target domain=unspecified mFlowKey=832 ]]. 
13:46:21:865 dialer-baDialer Trace: (RESIP) TransactionState::processServerNonInvite: SipResp: 415 cid=875d601c-803f1b7c-0f42dd21-1739f77c tid=5A5EF5141D cseq=BYE / 103 from(tu). 
13:46:21:865 dialer-baDialer Trace: (RESIP) Adding timer: Timer J tid=5A5EF5141D ms=32000. 
13:46:21:865 dialer-baDialer Trace: (RESIP) tid=5A5EF5141D sending to : [ V4 10.240.112.248:5060 UDP target domain=unspecified mFlowKey=832 ]. 
13:46:21:867 dialer-baDialer Trace: (RESIP) Looked up source for destination: [ V4 10.240.112.248:5060 UDP target domain=unspecified mFlowKey=832 ] -> [ V4 10.240.112.25:0 UDP target domain=unspecified mFlowKey=832 ] sent-by=10.240.112.248 sent-port=5060. 
13:46:21:867 dialer-baDialer Trace: (RESIP) Transmitting to [ V4 10.240.112.248:5060 UDP target domain=unspecified mFlowKey=832 ] tlsDomain= via [ V4 10.240.112.25:58800 UDP target domain=unspecified mFlowKey=832 ]

SIP/2.0 415 Unsupported Media Type
Via: SIP/2.0/UDP 10.240.112.248:5060;branch=z9hG4bK5A5EF5141D
To: <sip:10000@10.240.112.25>;tag=643e4c04
From: <sip:8880411590226@10.240.112.248>;tag=3A39A434-71F
Call-ID: 875d601c-803f1b7c-0f42dd21-1739f77c
CSeq: 103 BYE
Content-Length: 0

解决方案：

在接收来自拨号器的呼叫的拨号对等体下配置signaling forward none。

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cust_contact/contact_center/icm_enterprise/icm_enterprise_10_0_1/User/Guide/UCCE_BK_O9CF9347_00_outbound-option-guide-for-ucce.pdf

dial-peer voice 888 voip
 session protocol sipv2
 incoming called-number 888T
 voice-class codec 1  
 voice-class sip rel1xx supported "100rel"
 dtmf-relay rtp-nte
signaling forward none 
 no vad

signaling forward none将阻止网关将GTD负载转发到网络中的终端。

http://www.cisco.com/en/US/docs/ios/12_3/vvf_r/vrg_s2_ps1839_TSD_Products_Command_Reference_Chapter.html


应用此命令后，没有Multiple-MIME已转发到Dialer，问题已解决。