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Avaya extension to extension across WAN not working

Posted on 2013-10-29
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Last Modified: 2013-11-25
Hi everyone,  to start I am not an Avaya expert.

I have a client that has an issue with their Avaya system and extension to extension dialing.

They have two Avaya PBX units; IP500(Site1) and an IP500v2(Site2) on either side of the WAN.  

Site1 is an existing site and has been up for over 3 years.
Site2 is a new installation and addition.

I had recommended and installed Sonicwall TZ205 devices at each site and configured a site to site VPN for each office.  The VPN is up and from all accounts is working properly.

I can ping the Avaya PBX boxes from either side of the WAN.  For that matter, all communication is function correctly across the WAN.

The issue is when trying to initiate extension to extension dialing to phones on either side of the WAN.

The error message that appear on the phones are:

From Site1 they dial ext 510 located at Site2 – After long pause it showed: "Unobtainable 510".

From Site2 they dial ext 420 located at Site1: "Incompatible 420".

Here is the interesting part, their Avaya tech says this is because the firewall is dropping the Avaya communications between sites.

I totally disagree as the VPN is a trusted link and I have allowed all traffic between the two sites over VPN.

Does any one have any thoughts on this issue?
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Question by:nappy_d
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Expert Comment

by:Diverse IT
ID: 39610954
Hi nappy_d,

I won't speak to the Avaya side because that is not my forte either.

When you say,
Here is the interesting part, their Avaya tech says this is because the firewall is dropping the Avaya communications between sites.

I totally disagree as the VPN is a trusted link and I have allowed all traffic between the two sites over VPN.
To rule out the firewall as playing a part in this...on the SonicWALL, go to Log > Categories and make sure Log is selected so that all categories will be logged.

Also, do a Packet Capture to see what is happening to the packets. Please post results.

Let me know how it goes!
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nappy_d earned 0 total points
ID: 39611179
Thanks. I've been on the phone with Sonicwall and we see no proof of VOIP traffic being dropped. we've actually done packet tracing between the two PBX boxes' IP.

I found this doc that shows it is a supported connectivity solution. https://devconnect.avaya.com/public/download/dyn/SonicWall-IPO.pdf. Their Avaya tech hasn't even as much provided possible ports their PBX requires to be open for inter device communication.

I'm really hoping an Avaya tech is out here and can lend some input.
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Expert Comment

by:Diverse IT
ID: 39613748
Glad to hear you have it buttoned up on the network side. I'm not a phone Expert so I'm making a call for more Experts (hopefully Avaya ones!) to look at this question.
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Author Closing Comment

by:nappy_d
ID: 39674177
No experts with VOIP experience has responded :(
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