Outgoing Call is not working on CME with SIP Phones

[mohmmed.sabu@itqan.ae]

Hi Friends,

I have implemented the CME 10.5 with Cisco 8800 Series phones. I am facing the issue with outgoing calls, when the phone has off Hook then dial the external number and after dial the 2 digits, it's getting fast busy. If I dial the extension and then press the call button and it's working fine.

 Cisco 8841>>CME 10.5(SIP)>>4FXO>>Telco.

Attached the logs.

[R0g22 · Accepted solution]

Add "no digit collect kpml" and reset the phone. Test it after that.

[timhughsmith]

If you turn off KPML, doesn't this mean the phone will now have 10 second timeout before sending anything to CME/SRST etc?

[R0g22]

Are you talking about T.302 ? I don't think so. With KPML you are doing a digit by digit dialing. Without it and with rtp-nte, you basically do a en-bloc. I believe interdigit applies to both but with KPML enabled, the IOS has a tendency to match the digit pre-maturely resulting in call failures.

[timhughsmith]

Yeah that's the issue we see.

If you turn off the digit collection via KPML, it allows you to dial off hook

If you turn it on, it does pre-maturely match it.

Is there any fix for the early matching problem?

Cheers,

Tim.

[R0g22]

To be honest and AFAIK, its not a defect. Thats how IOS works. It is not intelligent like CUCM and does a premature pattern match. The way to fix this is to disable kpml collect. I have seen it working and not working with the config in place. The behavior is not consistent.