Unattended Transfer Fails in Communicator

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  Software:

  Microsoft Communicator

  OCS 2007
  Mediation Server

   

  PSTN Gateway:
  OpenSIPS

  Asterisk 1.6

   

  The issue doesn't appear to be with the traffic from mediation to asterisk. Incoming and outgoing calls are fine, calls can be placed on hold.

   

  Attended transfers work, conferencing works, and even a call external to external transfer works (ie, we can call out, dial out a second call, and remove communicator from the call, leaving the two remote parties talking).

   

  However, a blind transfer in this scenario does not work:

  Call is made out from User A, to External Party. External Party answers call. User B is going to have the call transferred in a blind transfer - so the transfer option is clicked, and the user is chosen.

   

  The call isn't received by User B - it goes to User B's voicemail instead.

   

  The SIP traffic between mediation server and opensips / asterisk is returning OK results. The only error found is a response to mediation server from communicator, below is the request and response (request from mediation, response from communicator), the 488 Not Acceptable Message suggests there is an issue with the message sent to Communicator from Mediation Server.

   

  Any ideas (packets slightly modified to preserve privacy).

   

  Code Snippet

  INVITE to communicator:

  INVITE sip:192.168.1.27:56605;transport=tls;ms-opaque=3cf4086e1f;ms-received-cid=6A100 SIP/2.0
  Record-Route: <sip:pool1.x:5061;transport=tls;ms-fe=HOSTNAME.x;ms-role-rs-from;lr;ms-route-sig=ffdQFftwU8zMps0dgLzhJt79CccB0lkulkFD52LgAA>;tag=30A1229E2F585DFDB607A93646ADC301
  Via: SIP/2.0/TLS 192.168.1.207:5061;branch=z9hG4bKD064C557.2592E964;branched=TRUE;ms-internal-info="cb5gbNRASU7TyqXtaYMSsCByINDYslkulk514urwAA"
  Proxy-Authentication-Info: Kerberos rspauth="602306092A864886F71201020201011100FFFFFFFF4B2157E9CD232580A319011D47ABF1F3", srand="1E4A0C25", snum="16", opaque="52E541F1", qop="auth", targetname="sip/HOSTNAME.x", realm="SIP Communications Service"
  Max-Forwards: 69
  Content-Length: 934
  Via: SIP/2.0/TLS 192.168.1.208:1353;branch=z9hG4bK7cb44b5c;ms-received-port=1353;ms-received-cid=6A300
  From: <sip:012345678@x;user=phone>;epid=F3BD620152;tag=8cd0ada12e
  To: <sip:first.last@x>;epid=f7b605a7f5
  CSeq: 38 INVITE
  Call-ID: ff09d06e-89be-45fe-b0f6-c8ef354c8230
  Contact: <sip:MEDIATION.x@x;gruu;opaque=srvr:MediationServer:kHow0-Jsc0CRkZZoIwDtwAAA;grid=aee6b629a732479ca44bc262f0ca632d>;isGateway
  Referred-By: <sip:myself.last@x>;ms-referee-uri="sip:012345678@x;user=phone";ms-identity="AVwCAQExDzANBgkqhkiG9w0BAQUFADALBgkqhkiG9w0BBwExggE3MIIBMwIBATCBjDB-MRIwEAYKCZImiZPyLGQBGRYCYXUxEzARBgoJkiaJk_IsZAEZFgNjb20xITAfBgoJkiaJk_IsZAEZFhFsaXZlc3RvY2tleGNoYW5nZTEcMBoGCgmSJomT8ixkARkWDGhlYWRxdWFydGVyczESMBAGA1UEAxMJbGVzdnJ2czAyAgpZ-RVcAAAAAAAUMA0GCSqGSIb3DQEBBQUAMA0GCSqGSIb3DQEBAQUABIGAT2lctYlX63dib-eQwUvJSrO5pn1HG4bhpXJ8A_JLbjW77Pknlh3SHUnRB0LXZ20NmpsW9H301D4og3lqGcWgppZTnyAqSxdnwc7rjFx0Wu94h2QWqAu9_b0opBXpcCUvP329avDW5KSELHAYxFp_0e5LYnpyAw8sfIJIfrcplBIA:Tue, 25 Nov 2008 08:18:54 GMT";ms-identity-info="sip:pool1.x:5061;ms-fe=HOSTNAME.x;transport=tls";ms-identity-alg=rsa-sha1
  Supported: replaces
  Supported: gruu-10
  User-Agent: RTCC/3.0.0.0 MediationServer
  Content-Type: application/sdp; charset=utf-8
  Allow: UPDATE
  Allow: Ack, Cancel, Bye,Invite,Refer

  v=0
  o=- 0 0 IN IP4 192.168.1.208
  s=session
  c=IN IP4 192.168.1.208
  b=CT:1000
  t=0 0
  m=audio 62142 RTP/AVP 97 101 115 111 0 8
  c=IN IP4 192.168.1.208
  a=rtcp:60106
  a=candidate:WLZsewwjR/l7t056Yuj7x7W3/LlHqIdA 1 1o3fcBwIy4g UDP 0.900 192.168.1.208 62142
  a=candidate:WLZ1sewwjR/l7t056Yuj7x7W3/LlHqIdA 2 1o3fcBwIy4g UDP 0.900 192.168.1.208 60106
  a=cryptoscale:1 client AES_CM_128_HMAC_SHA1_80 inline:E2089B1wwLRV7uMVcFeHdVcg8H|2^31|1:1
  a=crypto:2 AES_CM_128_HMAC_SHA1_80 inline:R59tXZG+1lb/9CTGG/dDZt1Q1uJKQdA/|2^31|1:1
  a=crypto:3 AES_CM_128_HMAC_SHA1_80 inline:QNCCROPKne+SBLz58Zj3QEOhujpjAAIfTHr|2^31
  a=label:main-audio
  a=rtpmap:97 RED/8000
  a=rtpmap:101 telephone-event/8000
  a=fmtp:101 0-16
  a=rtpmap:115 x-msrta/8000
  a=fmtp:115 bitrate=11800
  a=rtpmap:111 SIREN/16000
  a=fmtp:111 bitrate=16000
  a=rtpmap:0 PCMU/8000
  a=rtpmap:8 PCMA/8000
  a=ptime:20

   

  
  Response from communicator:

  
  SIP/2.0 488 Not Acceptable Here
  Via: SIP/2.0/TLS 192.168.1.207:5061;branch=z9hG4bKD064C557.2592E964;branched=TRUE;ms-internal-info="cb5gbNRAStaYMSsCByINDYslkulk514urwAA"
  Via: SIP/2.0/TLS 192.168.1.208:1353;branch=z9hG4bK7cb44b5c;ms-received-port=1353;ms-received-cid=6A300
  From: <sip:01234578@x;user=phone>;epid=F3BD620152;tag=8cd0ada12e
  To: "" <sip:first.last@x>;epid=f7b605a7f5;tag=a5e3f09bb8
  Call-ID: ff09d06e-89be-45fe-b0f6-c8ef354c8230
  CSeq: 38 INVITE
  Record-Route: <sip:pool1.x:5061;transport=tls;ms-fe=HOSTNAME.x;ms-role-rs-from;lr;ms-route-sig=ffdQFftwU8zMps0dgLzhJt79CccB0lkulkFD52LgAA>;tag=30A1229E2F585DFDB607A93646ADC301
  User-Agent: UCCP/2.0.6362.97 OC/2.0.6362.97 (Microsoft Office Communicator)
  Ms-client-diagnostics: 52001; reason="General processing error"
  Proxy-Authorization: Kerberos qop="auth", realm="SIP Communications Service", opaque="52E541F1", targetname="sip/HOSTNAME.x", crand="20705154", cnum="13", response="602306092a8648fffffff907e2de74b3ed90bb2a713bef4a9b9ee"
  Content-Length: 0

   

  Wednesday, December 10, 2008 10:31 PM