We have an IPSEC 3DES VPN L2L tunnel between an ASA5520 and a 851 router. The phone connected to the 851 frequently unregisters with the CM and or reboots. The fixup protocol is enabled for skinny port 2000 on the ASA.
All other data connections on the vpn tunnel work fine. Any ideas what would cause the phone problems?
Re: 7940 Phone Unregisters/Drops Calls on IPSEC VPN
Okay the EV shows the phone is frequently getting DeviceTransientConnection error events, however I was able to do directory name searches while the phone shows "CM down, features disabled" which tells me the VPN tunnel is working correctly for HTTP. What ports does a phone use to register with the CM and how/where do I change the increment keepalive timer in CM (4.1.3)?
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