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CUCM 7.1 => OPensips+Freeswitch SIP TRUNK no busy tone

Hi all,

we set up a sip trunk between a Cisco Call Manager 7.1 and a SIP telephony infrastructure (Opensips as balancer + Freeswitch as media server).

We are experiencing a strange issue on the sip trunk: when we call a busy SIP phone (currently on a call, registered to Opensips + Freeswitch) from an SCCP Phone (registered on CUCM) the call is dropped on the SCCP PHone without any indication (busy tone on audio or message on display).

The opensips sends the busy 486 message to CUCM that correctly send the ack in response.

 

Everything else seems to be fine normal call are correctly completed, transfers are ok.

We tried to disable the MTP without success, MRGL is correctly configured on SIP trunk. Ports are ok.

Can you please help in debugging?

Please find below a trace captured on SIP OPensips balancer, here you are the hosts involved:

10.100.0.70 is OpenSips balancer IP

172.22.72.2 is CUCM 7.1 server IP

9013 is the SIP Phone registered on Opensips + freeswitch system

8242 is the SCCP Phone registered on CUCM 7.1

Call is from 8242 => 9013

 

Thanks

BR

FRancesco

 

U 2014/05/15 12:19:04.047707 10.100.0.70:5080 -> 172.22.72.2:5060

SIP/2.0 486 Busy Here.

Via: SIP/2.0/UDP 172.22.72.2:5060;branch=z9hG4bK227d5d7582ae.

Max-Forwards: 68.

From: <sip:8242@172.22.72.2>;tag=12ebdeb7-fd81-4624-a5c5-c3fb06a777dc-38301773.

To: <sip:9013@10.100.0.70>;tag=9raKNFS3aUBeN.

Call-ID: 554c0b00-37419497-13bc-24816ac@172.22.72.2.

CSeq: 101 INVITE.

User-Agent: FreeSWITCH-mod_sofia/1.2.23+git~20140331T223230Z~693eea0d03~64bit.

Accept: application/sdp.

Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE.

Supported: timer, path, replaces.

Allow-Events: talk, hold, conference, presence, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer.

Reason: Q.850;cause=16;text="NORMAL_CLEARING".

Content-Length: 0.

P-Asserted-Identity: "9013" <sip:9013@10.100.0.70>.

.



U 2014/05/15 12:19:04.050294 172.22.72.2:5060 -> 10.100.0.70:5080

ACK sip:9013@10.100.0.70:5080 SIP/2.0.

Date: Thu, 15 May 2014 10:19:03 GMT.

From: <sip:8242@172.22.72.2>;tag=12ebdeb7-fd81-4624-a5c5-c3fb06a777dc-38301773.

Allow-Events: presence, kpml.

Content-Length: 0.

To: <sip:9013@10.100.0.70>;tag=9raKNFS3aUBeN.

Call-ID: 554c0b00-37419497-13bc-24816ac@172.22.72.2.

Via: SIP/2.0/UDP 172.22.72.2:5060;branch=z9hG4bK227d5d7582ae.

CSeq: 101 ACK.

Max-Forwards: 70.

 

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