Integrating 3CX with Cisco Call Manager Express and Unity

[mlump]

I have recently been asked to integrate 3CX with our existing Cisco Cisco Call Manager Express and Unity Express system.
Cisco CME IP address is: 10.10.10.1
Cisco Unity IP address is: 10.1.10.1
3CX Server IP address is: 10.10.10.254

I have a VoIP Provider setup on 3CX that does successfully connect with the Cisco Call manager (CME) and i do have calls flowing back and forth. However when you call a Cisco ext from a 3CX ext and the Cisco ext does not answer the Cisco CME then diverts the call to Unity by Sending a SIP "Moved Temporarily" message that has a contact field of [email protected] which is the ext and IP of Unity. At this point 3CX terminates the call with No Known route to [email protected]. See Logs below:

14:34:38.096 [CM503020]: Normal call termination. Reason: Terminated
14:34:38.095 [CM503016]: Call(36): Attempt to reach <sip:[email protected]> failed. Reason: Redirected
14:34:38.056 [CM503003]: Call(36): Call to sip:[email protected]:5060 has failed; Cause: 302 Moved Temporarily; from IP:10.10.10.1:5060
14:34:38.041 [CM503014]: Call(36): No known route to target: <sip:[email protected]>
14:34:38.038 [CM503006]: Call(36): Diverted to: <sip:[email protected]>
14:34:36.562 [CM505003]: Provider:[Cisco] Device info: Device Not Identified: User Agent not matched; Capabilities:[reinvite, replaces, able-no-sdp, recvonly] UserAgent: [Cisco-SIPGateway/IOS-12.x] PBX contact: [sip:[email protected]:5060]
14:34:36.562 [CM503002]: Call(36): Alerting sip:[email protected]:5060
14:34:36.352 [CM503025]: Call(36): Calling VoIPline:2042@(Ln.10000@Cisco)@[Dev:sip:[email protected]:5060]
14:34:36.293 [MS210002] C:36.2:Offer provided. Connection(transcoding mode): 10.10.10.254:7160(7161)
14:34:36.239 [CM503004]: Call(36): Route 1: VoIPline:2042@(Ln.10000@Cisco)@[Dev:sip:[email protected]:5060]
14:34:36.232 [CM503010]: Making route(s) to <sip:[email protected]>
14:34:36.230 [MS210000] C:36.1:Offer received. RTP connection: 10.10.10.80:11788(11789)
14:34:36.222 Remote SDP is set for legC:36.1
14:34:36.221 [CM505001]: Ext.2500: Device info: Device Not Identified: User Agent not matched; Capabilities:[reinvite, replaces, able-no-sdp, recvonly] UserAgent: [Yealink SIP-T32G 32.0.0.106] PBX contact: [sip:[email protected]:5060]
14:34:36.140 [CM503001]: Call(36): Incoming call from Ext.2500 to <sip:[email protected]>
14:34:36.082 [CM500002]: Info on incoming INVITE:
INVITE sip:[email protected] SIP/2.0
Via: SIP/2.0/UDP 10.10.10.80:5062;branch=z9hG4bK1605795914
Max-Forwards: 70
Contact: <sip:[email protected]:5062>
To: <sip:[email protected]>
From: "test this"<sip:[email protected]>;tag=591110465
Call-ID: [email protected]
CSeq: 2 INVITE
Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE
Proxy-Authorization: Digest username="2500",realm="3CXPhoneSystem",nonce="414d535c05fbe33b91:1b895517311c9bc0031342dd64489a14",uri="sip:[email protected]",response="449ab7712f754acfcee77c299aea0844",algorithm=MD5
Supported: replaces
User-Agent: Yealink SIP-T32G 32.0.0.106
Allow-Events: talk, hold, conference, refer, check-sync
Content-Length: 0

I can Successfully dial the unity ext by dialing 6000 from a 3CX phone. I have also tried creating a second VoIP provider that connect directly to the unity IP and can dial ext. 6000 using that also. I have also turned on direct sip calling and can call [email protected] directly with no issues. However every-time 3CX receives the SIP "Moved Temporarily" message i get the above results. This is a bit of a show stopper and i need to get this fixed. Any advice would help greatly.

Thank you,
Mike Lump
ComResource a Premier 3CX Partner

 

[mlump]

Re: Integrating 3CX with Cisco Call Manager Express and Unit

I found the solution to this a while back if anyone is interested. Since 3CX does not support Moved Temporarily responses from a SIP Trunk I had to disable the 302 Moved Temporarily from being sent on the Cisco end. What this forces the Cisco CME to do is Hairpin the call and corrects the problem.