Cisco 7821 and Asterisk

[aolo00]

Hi guys,

we have a lot of Cisco 7821 with firmware SIP78xx.12-5-1SR2-2 configured and working with Asterisk.

Sometimes some phone deregisters and does not re-register itself.

Theese are our template conf for registration:

<timerInviteExpires>180</timerInviteExpires>
<timerRegisterExpires>3600</timerRegisterExpires>
<timerRegisterDelta>5</timerRegisterDelta>
<timerKeepAliveExpires>120</timerKeepAliveExpires>
<timerSubscribeExpires>120</timerSubscribeExpires>
<timerSubscribeDelta>5</timerSubscribeDelta>
<timerT1>500</timerT1>
<timerT2>4000</timerT2>

Any idea how to improve these configurations or understand the problem?

Because same environment other phone brands we have no problem and not all Cisco phones have this problem.

[balaji.bandi]

check all the Devices has same Version of code running.

Enable some debug on Asterisk see why this is failing. ( how are you resolving this issue ?) - Hope all your NTP Settings ok here ?

Can you post fill template XML file or refer below template for reference :

https://community.cisco.com/t5/ip-telephony-and-phones/cisco-7821-and-asterisk/td-p/2581069

[aolo00]

Yes, all devices have same version.

We had no error on log but we didn't enable sip debug during problem.

We solved with a phones reboot via ssh.

We have configured xml following link that you posted we have same tags for registration, expire time, retry etc.

[Leo Laohoo]

You have multiple phone models (and not just 7821)?

[aolo00]

Yes, multiple phones are Cisco 7821 and also we have Snom and Yealink registered on the same Asterisk server. Not all Cisco 7821 phones have problem.

[Leo Laohoo]

When the phones deregister, do they reboot?

[aolo00]

No, we made a manual reboot via ssh

[Leo Laohoo]

So the phones deregisters and you have to reboot the phones in order for it to register back again.
If this is the case, then I am suspecting this is a firmware bug.

[balaji.bandi]

you have not confirmed other phones have - same model and same firmware ? please confirm