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Phones Unregistering

I'm trying to resolve an issue with phones unregistering from the callmanager over a VPN connection. Almost daily the phones register to the local gateway and the tunnel does not go down. I attached the log of the local SRST gateway to which the phones are registering.

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Re: Phones Unregistering

The phone is timing out when trying to find the callmanager. SRST is depended upon a trigger on the phone. If the phone does not get a response to the callmanager specified in it's TFTP configuration, it will fall to the SRST specified and register. Somewhere you have a tunnel dropping or too much latency between the phone and the cucm cluster. There may be a timeout you can increase in the service parameters, but I do not have it in front of me. Possibly someone can add some more comments

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