You need to turn on the SIP trace in the VMSC to that the trace will show the SIP messages in the OHV.
That should tell us what is going on or at least point us in the right direction it should look like the below trace from the MAS
10/23/12 15:33:36, "Call Management", 21010, "Information", 0, "TXDA1SVA2", "Incoming ring.", 4,
10/23/12 15:33:36, "Call Management", 22212, "Error", 0, "TXDA1SVA2", "ERROR NT significant event with ID '3221227347' was reported with strings '18049656501\nChicago SIP\n'.", 0,
10/23/12 15:33:36, "PBX Integration", 21409, "Information", 0, "TXDA1SVA2", "Integration data: Extension . Called extension . Calling extension +18049656501. Call divert 1.", 0,
10/23/12 15:33:36, "Call Management", 21027, "Information", 25733, "TXDA1SVA2", "Incoming call detected.", 4,
10/23/12 15:33:36, "Call Management", 21030, "Information", 25733, "TXDA1SVA2", "Call routed.", 4,
10/23/12 15:33:36, "Call Management", 21008, "Information", 0, "TXDA1SVA2", "Channel on hook.", 2,
10/23/12 15:33:36, "Call Management", 21048, "Information", 25733, "TXDA1SVA2", "SIP IN :INVITE sip:sipmm@heart.org SIP/2.0
Record-Route: <sip:604083d1@10.14.251.54;transport=tcp;lr>
Record-Route: <sip:10.14.251.53:15060;lr;sap=-1650612390*1*016asm-callprocessing.sar888868362~1351024416281~-1329103579~1;transport=tcp>
From: sip:18049656501@heart.org;tag=8062ccd02821e21b77f4edbbea700
To: sip:sipmm@heart.org
Call-ID: 8062ccd02821e21b87f4edbbea700
CSeq: 1 INVITE
Record-Route: <sip:604083d1@10.14.251.54:5063;transport=tcp;lr>
Record-Route: <sip:10.14.251.55:5063;lr;transport=tcp>
Via: SIP/2.0/TCP 10.14.251.54;branch=z9hG4bK0A0EFB3578088880051039008-AP;ft=46816
Via: SIP/2.0/TCP 10.14.251.53:15070;branch=z9hG4bK0A0EFB3578088880051039008
Via: SIP/2.0/TCP 10.14.251.53:15070;branch=z9hG4bK0A0EFB3578088880151039006
", 4,
10/23/12 15:33:36, "Call Management", 21048, "Information", 25733, "TXDA1SVA2", "SIP OUT :SIP/2.0 100 Trying
Via: SIP/2.0/TCP 10.14.251.54;branch=z9hG4bK0A0EFB3578088880051039008-AP;ft=46816
Via: SIP/2.0/TCP 10.14.251.53:15070;branch=z9hG4bK0A0EFB3578088880051039008
Via: SIP/2.0/TCP 10.14.251.53:15070;branch=z9hG4bK0A0EFB3578088880151039006
Via: SIP/2.0/TCP 10.14.251.53:15070;branch=z9hG4bK0A0EFB3578088880151039005
Via: SIP/2.0/TCP 10.14.251.54:5063;branch=z9hG4bK8062ccd02821e21b97f4edbbea700-AP;ft=47016
Via: SIP/2.0/TCP 10.14.251.55:5063;branch=z9hG4bK8062ccd02821e21b97f4edbbea700
From: sip:18049656501@heart.org;tag=8062ccd02821e21b77f4edbbea700
To: sip:sipmm@heart.org
Call-ID: 8062ccd02821e21b87f4edbbea700
CSeq: 1 INVITE
Server: Modular Messaging
Content-Length: 0
", 4,
10/23/12 15:33:36, "Call Management", 21048, "Information", 25733, "TXDA1SVA2", "SIP OUT :SIP/2.0 180 Ringing
Via: SIP/2.0/TCP 10.14.251.54;branch=z9hG4bK0A0EFB3578088880051039008-AP;ft=46816
Via: SIP/2.0/TCP 10.14.251.53:15070;branch=z9hG4bK0A0EFB3578088880051039008
Via: SIP/2.0/TCP 10.14.251.53:15070;branch=z9hG4bK0A0EFB3578088880151039006
Via: SIP/2.0/TCP 10.14.251.53:15070;branch=z9hG4bK0A0EFB3578088880151039005
Via: SIP/2.0/TCP 10.14.251.54:5063;branch=z9hG4bK8062ccd02821e21b97f4edbbea700-AP;ft=47016
Via: SIP/2.0/TCP 10.14.251.55:5063;branch=z9hG4bK8062ccd02821e21b97f4edbbea700
Record-Route: <sip:604083d1@10.14.251.54;transport=tcp;lr>
Record-Route: <sip:10.14.251.53:15060;lr;sap=-1650612390*1*016asm-callprocessing.sar888868362~1351024416281~-1329103579~1;transport=tcp>
Record-Route: <sip:604083d1@10.14", 4,
10/23/12 15:33:36, "Call Management", 21048, "Information", 25733, "TXDA1SVA2", "SIP IN

RACK sip:10.0.0.104:5060;transport=tcp SIP/2.0
From: sip:18049656501@heart.org;tag=8062ccd02821e21b77f4edbbea700
To: sip:sipmm@heart.org;tag=e3178656596cbe4d
Call-ID: 8062ccd02821e21b87f4edbbea700
CSeq: 2 PRACK
Via: SIP/2.0/TCP 10.14.251.54;branch=z9hG4bK0A0EFB3578088880051039011-AP;ft=46816
Via: SIP/2.0/TCP 10.14.251.53:15070;branch=z9hG4bK0A0EFB3578088880051039011
Via: SIP/2.0/TCP 10.14.251.53:15070;branch=z9hG4bK0A0EFB3578088880151039009
Via: SIP/2.0/TCP 10.14.251.54:5063;branch=z9hG4bK8062ccd02821e21ba7f4edbbea700-AP;ft=47016
Via: SIP/2.0/TCP 10.14.251.55:5063;branch=z9hG4bK8062ccd02821e21ba7f4edbbea700
User-Agent: Avaya CM/R015x.02.1.016.4 AVAYA-SM-6.0.2.0.602004
Ken Means
"I find that the harder I work, the more luck I seem to have."
- Thomas Jefferson (1743-1826)