Phones getting unregistered frequently from call Manager

Hi
We have Call manager in our HQ and some phones in Branch in a different country. From CUCM there is a SIP trunk towards router in branch.
Users in branch occassionally complain of phones getting unregistered.HQ and branch are connected through internet with suffiecient BQ 14 Mbps on each side.
Thanks for helping me out.
Regards
Vibha

Hi Vibha,
You can check the Phone status messages to start with and also check the app / syslogs on the cucm corresponding to the time stamp when they are unregistered to see the reason code for the unregistered event. However, a packet capture would be ideal to check what exactly is causing the issue as we can see which packets are exchanged or getting dropped between cucm and IP phone.
HTH
Manish

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