Avaya CM: One way audio when the call is from VPN to LAN

[Rubzrain]

We try to setup a VPN. Unfortunately we tried to conduct a test call for VPN to LAN. And there's a one way audio. But for LAN-LAN calls it is working.

 

[sekitori]

We had a similar problem which turned out to be something with the portrange

 

[janni78]

Can you ping the gateway from the VPN?

"Trying is the first step to failure..." - Homer

 

[Wanebo]

99 times out of 100 when you have 1 way voice path you have either a codec mismatch or packets from one direction not making it back through the proper path through the proper ports.

For the first, list trace the stations and see what they are negotiating.

For the second you will probably need some packet captures.

 

[dialtonebone]

Do a list tra station and check to see where the audio path is going (also available via a status station). If the two endpoints can't communicate due to a firewall rule this will stop the audio. This data could change with every call (med pros, shuffled calls etc) so make sure you account for all call flows.

 

[Rubzrain]

All of our testing for vpn to lan is always one way audio. And we do a list trace and all packets is looks find. No jitter and packet lost. All port in the VPN server is open.

 

[Rubzrain]

We tried ping the gateway and cm in vpn server and its pingable.

 

[sekitori]

Signalling also one way (phone only rings on one side) ?

Do you get any packets at all at the far end ? Hook up a laptop at the far end and capture there...

Have you tried a phone with VPN firmware ?

Sekitori

 

[janni78]

In which direction doesn't the audio flow?
Is the CM on the LAN or are the IP Phones on a separate network? In that case can you ping an IP Phone on the LAN.
If you call a VDN can you hear announcements?


"Trying is the first step to failure..." - Homer

 

[jimbojimbo]

In the IP-Network Region where the VPN phones are located turn of Inter direct-IP and shuffling. This will cause the call to "anchor" and should resolve your 1-way issue. It does impact the number of DSP resources used so make sure you're not over committing.

If all works well you have a firewall issue. Assuming these might be something like a Cisco ASA?