| Ports
Your problem is with your ports. Since you already have connectivity and are experiencing one way audio, what version your at shouldn't matter. IT Enginners above post is correct in asking what type/version of system because in the Axxess version 8.x to 9.x they restrict the IPRC Card (not IP devices) from routing through any NAT. There logic was to prevent latency.
Basically your missing a range of UDP ports for 5004
Here is the list....if your using a 5000 IP PBX 5004 is changed to 6004, but same principals apply.
*****Audio Recieve Port*****
*****UDP: 5004 -5070*****
Terminal Call Control
TCP:5566
General Purpose
UDP:5567
Call Control
TCP:5570
....The IP phone dynamicaly picks any one of the UDP port 5004 -5070 and sends audio down that port. If you want to verifiy this before you make the change in your firewall, use Etherreal or any other protocol capture device and run it while you make a couple of one way audio IP calls. Stop the capture device and find your voice transmisions, they might be labeled as RTP , or do a sort by IP to find the device. A protocol capture will break down each data packet into it 7 layer OSI functions. Look at layer 4 to see the destination and source port. I bet you find the device trying to send audio on a port other then 5004.
Hope this helps, I have a hard time explaining all the crap in my head. |