Avaya IP office IP call dropout


We are having a problem with a pair of  Avaya IP office 500 telephone switches - both running version 4.2 (14). They are on two seperate sites which are connected via an IPSEC site to site VPN (Cisco ASA 5505  to Cisco 1801). Call establishing and call quality are both fine but the call will only ever last for 60 seconds exactly at which stage it drops out. I've checked the logs on both the router and ASA and no relevant traffic is being dropped.

The ACL matching interesting traffic is matching all IP between the two subnets in question.
When the two Avaya switches are connected back to back (i.e. without the VPN) the calls do not dropout.

Can anyone help?


Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

I've seen very similar effect but at 32 seconds. Very strange. Never did solve it directly.

In the end we gave up on the VPN - for VOIP at least - we did a 1:1 nat mapping for the PBX and opened the SIP/RTP ports on the firewall for that public IP (but only to the IP of the other office!) and never looked back.

I ran into the same issue with a customer that allready had an ip406v2 install when we got them.  I ended up replaceing 2 pix501's with netgear fvs338's and p2p vpn's, all the problems went away.  I would look at system monitor, and filter by h323, voip, rtp, etc and see if you get any better info.
I've fixed this 60 second issue by disabling h323 inspection on the ASA

policy-map global_policy
 class inspection_default

no inspect h323 h225
no inspect h323 ras

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Powerful Yet Easy-to-Use Network Monitoring

Identify excessive bandwidth utilization or unexpected application traffic with SolarWinds Bandwidth Analyzer Pack.

PhilMacavityAuthor Commented:
Perfect. We originally thought this may have been a bung inthe Avaya software as we were seeing TCP resets being sent in some packet sniffs that were run. I've removed the config you suggested and everything is working fine.


ASA command fixed issue on another site running IPO 5.0.8
Had the same Problem disabling inspect h323 h225 h323 ras also worked for me!
Thank you
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Voice Over IP

From novice to tech pro — start learning today.