Random Cisco phone just start registering in middle of call

[Tazio4436]

Hi,

My phone system (CCM and CUC )has been up for long time without any issue.

Only today 3 users told me that while they were on a call , all of a sudden the phone start registering and the call is dropped and then phone is back up in service.

Is there anyway I can check why this happened

What might be the cause as all other phones had no issues.

Thanks

Tazio

[Leonardo Santana · Accepted solution]

Hi,

Only 3 IP Phones?

That could be many things, you can start looking at the switch to see the port status.

Check these links too to help your troubleshooting:

https://community.cisco.com/t5/collaboration-voice-and-video/ip-phone-registration-issues/ta-p/3136426 

https://community.cisco.com/t5/collaboration-voice-and-video/troubleshooting-ip-phone-registration/ba-p/3103422 

Use RTMT to see the reason of this lost of register.

[Tazio4436]

Hi, 

Thanks for the quick reply.

I got 3 complaints because those users were on call at that time so they lost the call that is why they complained.But i asked couple of other users and some did not even notice anything but some also said that they saw the phone registering , but this happened very quickly.

My users are spread out on couple of different SW an I checked the ports on each SW where those users are connected. The ports are clean and no errors.

I will go through the link a bit later today.

As for RTMT, I was there but did not know how to get information about specific ext (or phone).

Thanks

Tazio

[Tazio4436]

Hi,

Issue resolved by itself.

I have been monitoring since my last post.

Thanks everyone

Tazio

[Nithin Eluvathingal]

Only today 3 users told me that while they were on a call , all of a sudden the phone start registering and the call is dropped and then phone is back up in service. So this happened when  they where on a call, looks like a network  issue which made the phone to restart .