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New Member

Calls dropping

Greetings,

Calls, IP to IP, PSTN to IP, IP to PSTN are dropping.

IP phone hears ring, sees caller id, goes off-hook and dead-air...at the remote side the PSTN caller does not hear ring. It is the same scenario when the call is IP to IP, PSTN to IP, IP to PSTN.

Rick

9 REPLIES
New Member

Re: Calls dropping

Device sequence

IP phone----CM3.08---7206h323 GW----PSTN

New Member

Re: Calls dropping

Cisco Employee

Re: Calls dropping

What version of IOS are you running on the 7206? Does this happen on ever call or just random throughout the day. Are the 7206 and the ip phones on the same vlan? Are you also saying that you cannot call from 1 ip phone to another?

Thank you,

New Member

Re: Calls dropping

Mike,

IOS is 12.1(5)T7

This is an intermittent problem but it does happen several times/day on random phones.

yes...ip phone --- CM-----ip phone.

Cisco Employee

Re: Calls dropping

From your description it sounds like you might have one or more bad DSP chips on the voice blade. You should probably open a TAC case so they can take a look at things.

New Member

Re: Calls dropping

Dave,

I was watching the "i" call statistics on my phone after going off hook and dialing the number and TxCnt showed packets but the RxCnt was "0" packets and after a certain period of time, approx. 10 seconds the call dropped.

At the 7206 GW I saw the call setup then drop.

What can I look at on Call manager to see if I am receiving from the 7206 GW ?

7940---CM3.0(8)---7206-----PSTN

Rick

Cisco Employee

Re: Calls dropping

You would need to turn on detailed tracing for CallManager and then look at the trace files. You would probably want to send them to TAC to help you decipher what is happening. Another thing you can do is open the CCM trace file with the Q.931 Translator which is in C:\Program Files\Cisco\bin

http://www.cisco.com/warp/public/788/AVVID/cm_trace.html

New Member

Re: Calls dropping

Dave,

I upgraded the 7940 firmware to device load P003E310 and the problem appeared to have gone away..

Cisco Employee

Re: Calls dropping

That definitely confuses me. What firmware load was being used before this one? If you downgrade one of the phones to whatever other load, can you make the problem happen again?

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