CALL DROP ISSUE

[ibrahimkajeri]

Hello , 

We are facing CALL DROP challenge as well as automatic activation of loudspeaker when answering calls. Extensions with this problems are 106,109 and 112.For other extensions , the issue happens very rare.

Attached is running config .

Pls go through and advise what might be wrong

Router in use is Cisco ISR 4331/K9 and IP phone models are Cisco CP-7821

Thanks,

Ibrahim

[Marco Rojas Abarca]

Dear ibrahimkajeri,

From the running config seems like these devices are registered to CME. CME is no longer supported:

End-of-Sale and End-of-Life Announcement for the Perpetual Licensing for Unified Communications Manager Express Version 14
https://www.cisco.com/c/en/us/products/collateral/unified-communications/unified-communications-manager-express/unified-communications-manager-express-v14-eol.html

Moreover, to provide some additional insight regarding why calls are dropping, debugs will be required while the issue happens. According to what I see, below is the list of the debugs I would say we require:

debug ccsip messages
debug ccsip info
debug voip ccapi inout
debug vpm signal

The above debugs, when the issue happens, is the first step to start the triage on this case.

Hope this information helps,
Sincerely,
Marco R.

[Maren Mahoney]

@Marco Rojas Abarca - Perpetual licensing for CUCME has ended, but CUCME 14 is still sold and supported with licensing through Collaboration Flex Plan. You may want to revise your post so as to not confuse people who read it later.

@ibrahimkajeri Your config looks very straightforward and I see no reason for phones to automatically activate with speakerphone or anything obvious that would cause call drops. So as noted please provide debug ccsip messages and debug ccsip events for an affected call.

I recommend against debug voip ccapi inout during production hours as the output is very large and won't show speakerphone activation, and would only be a secondary debug command if debug ccsip messages fails to show why the calls are dropping. Ditto with debug vpm signal, which I would only activate if I thought DSPs on a voice module were having an issue.

Let us know what you find so we can help.

Maren