After 15 minutes a SIP connection drops over Trunk SIP

[Thiago Gandara]

Hi voice team,

I configured a trunk sip with another PBX SIP, the calls flow is: CUCM -> FIREWALL -> PBX SIP.

But in all connections after 15 minutes, the call drop.

Thanks,

[Leo Salcie Tejeda]

Hi Thiago,

Maybe the firewall is blocking the call for any reason. Have you check for any violation rule during the call in the firewall?

Can you tell us which PBX SIP vendor you're working with?

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[Thiago Gandara]

the firewall is not blocking anything, everything is released.

The PBX Sip is a Asterisk Server.

[Leo Salcie Tejeda]

Are lossing packet between both site?

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[Jagpreet Barmi]

Hi Thiago,

It appears that the session expires timer is likely firing.

The initial invite to establish the call would have the SE timer specified, and after that timer duration you should see a re-Invite. 

As a workaround, you can try to increase the timer, but that won't explain why the reinvite is not happening as expected and once that time is expired, the call may drop again.

In order to use the workaround, please increase the "SIP Session Expires Timer" and "SIP Min-SE Value" under service parameters.

Again, this would be a workaround, however, to confirm and find the exact cause of the issue, please collect detailed CUCM traces for the time when the call is initiated till it expires.

HTH,

Jagpreet Singh Barmi

[Thiago Gandara]

After mark SIP Ping options on SIP Profile, work perfectaly.

Thanks,

[Leo Salcie Tejeda]

Hi Thiago,

That couldn't solved your problem. SIP Ping just monitor destination status for Trunks. If the remote SIP device fails to respond or sends back a SIP error response such as 503 Service Unavailable or 408 Timeout, Cisco Unified Communications Manager tries to reroute the calls by using other trunks or by using a different address.

That means you'sould still hitting the issue, maybe the call are using another route when it happend.

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