IP phone connected through VPN tunnel but no dial tone

[davidwu2007]

The site to site vpn connection is established between the ASA 5510 and ASA 5505. I can see the traffic going on between the IP phone and its server. However, the phone has no dial tone. I ping the phone's IP address within the tunnel but receive only 80% echo. Does anyone know what goes wrong? Thank you!

[rhugo]

It's dropping packets or streaming them out of order, so it sounds like either a routing issue or the version of ASA SW you are running? Check routing of packets by attaching a sniffer on the back of the phone on the other side of the tunnel and do a packet capture to see what's going on?

[davidwu2007]

Thanks for your reply.

We found the problem yesterday. It was the VPN

tunnel in which one side was using IP protocol while the other side was using TCP protocol.