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CUCM - SIP Phone hangs up when answered

tom.wall041
Level 1
Level 1

‎03-04-2016 06:03 AM - edited ‎03-18-2019 11:50 AM

I'm new to CUCM and am setting up a simple lab network.

I have successfully registered two SIP Phones to CUCM.

When I place a call from one phone to the other, it rings. However when I answer it, the answering phone hangs up and the other phone gets a busy tone.

I've searched around a bit and can't seem to find any answers. 

Anyone have an idea what the issue might be?

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Manish Gogna
Cisco Employee
Cisco Employee

‎03-05-2016 08:32 PM

Make sure that the phones are in same device pool and there are no bandwidth limitations configured. If the issue persists you should gather the detailed callmanager service trace and post here

https://supportforums.cisco.com/document/126666/collecting-cucm-traces-cucm-862-tac-sr

Manish

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sflanagan
Level 1
Level 1

‎05-12-2016 06:22 AM

I have had this same thing happen when the two ip phones were using different codecs. Also things that come to mind to check is CSS / partition and location settings. As Manish mentioned device pool as well.

Thanks,

Stephen

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