VIOP over VPN tunnel not working - phone rings, but no Voice !! - all other traffic is ok.
Posted on 2007-10-03
we have an IPsec vpn tunnel established between 2 of our sites. one site is running a Soniccwall TZ170 device and the other is running ISA 2004. Tunnel is up and running and all traffic is flowing ok - virtually no dropped packets and can essentially ping every device on either side of the Tunnel. We have an IP phone system and want to utilize VOIP across the tunnel and the problem we have is that the phones ring at either end but there is NO VOICE transmission, i.e. the phone rings, you pikc up the line and it is dead.
Any insights/help would be truly appreciated.