Hi,
Hope you can help me - I'm out of my depth here!
So I have set up a SIP trunk (via an Enterprise CUBE) to a UK SIP provider. It works, I can place a call and it connects, two-way voice all is good. There are of course 2 call legs, one from CUCM (v8.6) to the CUBE via SIP and a second from the CUBE to the provider. Just for clarity the CUBE has a public address to which the dial-peer binds SIP for the external call leg, and a private address to which the dial-peer binds SIP for the internal leg.
So far so good...until I try a call transfer. I make an outbound call, get it connected, hit the transfer button on the phone and... nothing. The phone sort of freezes for a few seconds and the Transfer softkey is greyed out. A few seconds later the Transfer softkey returns to its previous state, and the call appears like its resumed (off hold) but there is now no voice traffic in either direction.
its very odd - and probably somthing I dont understand. The odd thing is that inbound calls (via another trunk but different provider) are fine, and I can transfer or hold or whatever without issue.
I watched the SIP messages on the CUBE when I hit the transfer and all I got was:
Received:
INVITE sip:07775xxxxxxx@10.75.75.100:5060;transport=tcp SIP/2.0
Via: SIP/2.0/TCP 10.75.75.200:5060;branch=z9hG4bK11766a4f7a3
From: "Peter Moore" <sip:7001@10.75.75.200>;tag=412~b2b44154-5f1c-40dd-beec-492fa4b45cb6-25681932
To: <sip:07775xxxxxxx@10.75.75.100>;tag=419E178-96
Date: Fri, 04 Apr 2014 16:02:06 GMT
Call-ID: 6dd80700-33e1d76f-3f-c84b4b0a@10.75.75.200
Supported: 100rel,timer,resource-priority,replaces
Min-SE: 1800
User-Agent: Cisco-CUCM8.6
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
CSeq: 104 INVITE
Max-Forwards: 70
Expires: 180
Allow-Events: presence
Supported: X-cisco-srtp-fallback
Supported: Geolocation
Session-Expires: 1800;refresher=uas
P-Asserted-Identity: "XXX XXXXX" <sip:7001@10.75.75.200>
Privacy: none
Remote-Party-ID: "XXX XXXXX" <sip:7001@10.75.75.200>;party=calling;screen=yes;privacy=full
Contact: <sip:10.75.75.200:5060;transport=tcp>
Content-Type: application/sdp
Content-Length: 220
v=0
o=CiscoSystemsCCM-SIP 412 2 IN IP4 10.75.75.200
s=SIP Call
c=IN IP4 0.0.0.0
t=0 0
m=audio 20354 RTP/AVP 18 101
a=rtpmap:18 G729/8000
a=ptime:20
a=inactive
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
Apr 4 16:02:06.819: //358/6DD807000000/SIP/Msg/ccsipDisplayMsg:
Sent:
2811-Cube-VPN(config-class)#SIP/2.0 100 Trying
Via: SIP/2.0/TCP 10.75.75.200:5060;branch=z9hG4bK11766a4f7a3
From: "XXX XXXXX" <sip:7001@10.75.75.200>;tag=412~b2b44154-5f1c-40dd-beec-492fa4b45cb6-25681932
To: <sip:07775xxxxxx@10.75.75.100>;tag=419E178-96
Date: Fri, 04 Apr 2014 16:02:06 GMT
Call-ID: 6dd80700-33e1d76f-3f-c84b4b0a@10.75.75.200
CSeq: 104 INVITE
Allow-Events: telephone-event
Server: Cisco-SIPGateway/IOS-12.x
Content-Length: 0
... thats all. Nothing else until I cleared the call.
I know its a long shot, but has anyone got any idea where to start troubleshooting this?
Thanks