Avaya calls over VPN dropping after 30 seconds

[ferna236]

I hope this is the right place to post this:

I am having trouble with site-to-site VPN setup. Each site has an IP office 500. I seem to have set up the tunnel but when I try making calls to the other end, the calls disconnect after exactly 30 seconds. I have tried googling and what not, but haven't come up with a solution. I've tried disabling H.323 inspection on firewalls at both ends (A Cisco ASA and a SonicWall) but with no results. No matter what I try, the problem doesn't seem to go away. Is there something I'm overlooking. Since the calls disconnect at almost exactly 30 seconds, I'm guessing the problem is with our Avaya systems and not with the firewalls.

[zakabog]

Which end has the PBX? Do the H.323 phones work fine from that side calling out and not going over the VPN?

[richa164]

Have you got rtp keep alive enabled on the ipo

[nash]

If the calls traverse a firewall such as Sonicwall or Cisco, then make sure that "Inspect H323 packet" and/or "Enable H.323 Transformations" is disabled?

[ferna236]

So apparently it was a problem with the 9621G firmware. Upgrading the firmware on the phones fixed the issue.