IP phone connected through VPN tunnel but no dial tone

Unanswered Question
Sep 17th, 2007

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!

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rhugo Wed, 09/19/2007 - 10:00

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 Wed, 09/19/2007 - 10:45

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.

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