Hello,I try to make G.729 calls with Nortel Softphone over VPN and firewall and it's curious but voice drops after a few seconds while signalisation still good. After 1 minute with no voice the softphone application crashes. If I use G.711 codec I ha...

Hi,I'm using a Cisco VPN concentrator 3000 and when two laptops are connected out of the office with VPN, they can't speak to each other with their IP Softphone. Signalisation is good because we can see the flashing key. But media stream is lost...Th...