I have lan2lan tunnels between 2 branch offices and the main office. The branch offices have ASA5505 and the main office has a PIX515E. We are using cisco soft phones at the branch offices and they can talk to the main office but cannot talk to each other. There is no audio even though the call connects. What we need is to configure the PIX515e such that there is RTP stream between the 2 branch offices. This can be achieved by creating a l2l vpn between the 2 branch offices but I am lookinfg for a soultion that allows data to flow between the 2 branches via the main office.
I have this problem too.