Incoming calls drop after 90 seconds

[naveedh]

Hi Complex1,

Thank your for the advice.

I checked the Keep Alive settings on the W52P and the keep alive was enabled, and the interval was 5 seconds. Actually, I've tested all the keep alive settings options as shown below:

Keep alive type: Default
UDP Keep Alive Interval: 5
Result: Incoming calls drop after 90 seconds.

Keep alive type: Options
UDP Keep Alive Interval: 5
Result: No incoming calls - ie. does not ring.

Keep alive type: Notify
UDP Keep Alive Interval: 5
Result: Incoming call drops after 90 seconds.

So it appears it's not the keep alive setting.

On the router I disabled the SIP Passthrough - it was previously enabled. Unfortunately, this did not resolve the issue. Incoming calls still drop after exactly 90 seconds.

Please be aware that I have enabled OpenVPN on the W52P, so the router will only be seeing openvpn traffic, not SIP traffic. The VPN server is not on my network, but on the Public Internet.