CUCM timer problem - 422 Session Timer too small

[radoslav-drabik]

Guys,

I am getting the Session timer too small message when calling to a proxy server.

I've gone through RFC 4028 and there is written that a new INVITE should be sent from the CUCM server back to the proxy server with a new (proposed) session-expiry timer. See the trace below (I have omitted some parts)

This is not happening in my case with CUCM 7.1.5. Do you know what the problem can be? Thank you.

INVITE sip:6xxx@x.x.x.x:5060 SIP/2.0

Date: Tue, 13 Mar 2012 13:21:06 GMT

Supported: 100rel,timer,resource-priority,replaces

Min-SE:  1800

Expires: 180

Session-Expires:  1800

SIP/2.0 422 Session Timer too small

Min-SE: 3600

Server: Cisco-SIPGateway/IOS-12.x

ACK sip:6xxx@x.x.x.x:5060 SIP/2.0

Date: Tue, 13 Mar 2012 13:21:06 GMT

CSeq: 101 ACK

[acampbell]

Hi,

Have you tried adjusting the Min-SE on the CUCM

To configure CUCM to have a Minimum Session Expires time <= 3600:

1. Log in to CUCM.

2. Go to

System > Service Parameters.

3. Select

Server = current server e.g. " (Active)".

4. Select

Service = Cisco CallManager (Active).

5. Search for

SIP Min-SE Value and set it to 3600.

Regards

Alex

[radoslav-drabik]

Hi

The same thing came to my mind too. But I am afraid that if I change the service paramter values I can run into a situation when calls with

Session-Expires: 1800 won't go through. I will try that in a lab and let you know.

Anyway I still don't understand why the CUCM server doesn't retry the request with adjusted values (MIN-se and Session-expires: 3600) as it's explained in the standard.

My current values:

SIP session expires timer:    1800 sec (by default)

SIP Min-SE Value:               1800 sec (by default)

Thank you.

[radoslav-drabik]

Hello

I've tested the same scenario by means of CUCM 8.x and CUCM 7.x in a lab and it was working for me. Both versions have formed another INVITE message with adjusted timers.

I am going to open a TAC case for it and we will see.

[Volodymyr Morskyy]

Configuring min se timer on gateway won't solve the issue for you?

Router(config)# voice service voip

Router(conf-voi-serv)# sip

Router(conf-serv-sip)# min-se time

[Karthik Sivaram]

Hello Radoslav,

You could be running into this  CSCsa54423.

Hope this helps!

Thanks,

Karthik