Call drops after called party answers

[Fikri FIRAT]

Hi all,

We are facing a strange issue in our IP telephony system. When placing a call, the call drops right after the called party answers it. 'debug ccsip messages' provided the attached log. The customers has been continuously reporting that they have been facing the issue for a long time. The problem is not dependant on the called number type (it occurs when dialing other cities, dialing GSM numbers, etc.) Do you have any ideas? Looking forward for your support. The location uses analog lines, not PRI.

Regards,

Fikri

Router Info

Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(24)T3, RELEASE SOFTWARE (fc2)

N4DIKILI uptime is 21 hours, 0 minutes

System returned to ROM by reload at 18:19:58 TR Tue Jan 22 2013

System restarted at 18:21:24 TR Tue Jan 22 2013

System image file is "flash:c2800nm-advipservicesk9-mz.124-24.T3.bin"

Cisco 2821 (revision 53.51) with 473088K/51200K bytes of memory.

Processor board ID FHK1341F2XX

2 Gigabit Ethernet interfaces

2 Serial(sync/async) interfaces

1 Virtual Private Network (VPN) Module

12 Voice FXO interfaces

8 Voice FXS interfaces

Call Manager Info

System version: 8.0.3.23033-1

Device Info

Cisco 7942 with SCCP42.9-1-1SR1S

[Harmit Singh]

Hi Fikri,

I looked at the debug output and I see the gateway sends a BYE to CUCM with normal call clearing (cause value 16):

Jan 23 15:15:45.832: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:

Sent:

BYE sip:811121000@10.231.100.107:5060;transport=tcp SIP/2.0

Via: SIP/2.0/TCP 10.103.96.1:5060;branch=z9hG4bK7C2160

From: <04554174>;tag=47C53B4-CEB

To: "Burak test" <811121000>;tag=56c1d08b-be7c-41a9-b496-cb41dcbe340e-147132898

Date: Wed, 23 Jan 2013 13:15:42 GMT

Call-ID: f9f69500-ff1e27b-36edd2-6b64e70a@10.231.100.107

User-Agent: Cisco-SIPGateway/IOS-12.x

Max-Forwards: 70

Timestamp: 1358946945

CSeq: 101 BYE

Reason: Q.850;cause=16

Content-Length: 0

++     Does this happen on every outbound call or is it intermittent?

++     Do you face any issues for incoming calls?

++     Is this a new setup or was this working fine before?

++     Can you please post the running config of this gateway?

Also, we need to see what's going on with the other call leg i.e. the one between the gateway and FXO. Kindly capture the following debugs for one outbound test call:

debug ccsip messages

debug voip ccapi inout

debug vpim signal

debug voip vtsp default

debug voip vtsp session

Once the call completes, please capture the following command as well:

Show voice trace            --> The same port through which the test call went out of.

--
Regards,
Harmit.

[Fikri FIRAT]

Hi Harmit,

Thank you for your quick support!

The problem does not happen on every outbound call,

There has been no report that it happens on incoming calls,

The setup is the same that we are using for numerous other locations (~250) which are working well.

The running-config is provided in the attachments.

I will provide the debugs that you requested as soon as possible, since the problem occurs intermittently, it will be difficult.

Regards,

Fikri

[Harmit Singh]

Hi Fikri,

Based on the info you provided, this sounds like a problem with certain FXO lines, maybe even one (due to its intermittent nature). The debugs would help verify the same. Also, I would suggest having the FXO lines tested by plugging them directly to an analog phone and confirm if you are able to get outbound calls to work on all lines.

HTH.

--
Regards,
Harmit.