AVAYA voice problem via VPN

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Dec 1st, 2008
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A client is trying to test voice over IP connectivity between 2 Avaya PBX's in 2 different branches.

IPSEC 3DES VPN is configured between the 2 branches, HO has an ASA5510 and branch has a PIX515 (version 6.2)

Full IP connectivity between the 2 sites is configured and tested.

The problem is that the AVAYA PBX in the HO (ASA) is able to call and talk to the other pbx in the branch(PIX), but when initiating the call from the branch,

the call setup is not working, and he gets directly a busy tone.

I tried to remove all the inspections on both firewall, but still had the same problem

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John Blakley Mon, 12/01/2008 - 07:36
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Can you post your fixup portion configs from the PIX?


jorjes1984 Mon, 12/01/2008 - 07:50
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fixup protocol dns maximum-length 512

fixup protocol ftp 21

no fixup protocol h323 h225 1720

no fixup protocol h323 ras 1718-1719

fixup protocol http 80

fixup protocol rsh 514

fixup protocol rtsp 554

no fixup protocol sip 5060

no fixup protocol sip udp 5060

no fixup protocol skinny 2000

fixup protocol smtp 25

fixup protocol sqlnet 1521

fixup protocol tftp 69

Note that i removed all the FIXUPs while doing the test and the problem was not solved.

Best regards,

jorjes1984 Mon, 12/01/2008 - 08:21
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Dar Jhon,

thank you for your reply,

But this is not the scenario that I have as

the voice packets are passing between two branches in IPSEC VPN tunnel terminated one side on a PIX and the other side on an ASA.

So it is a remote Access VPN where the AVAYA IP Phone connected via internet to the pix.

Best regards,

John Blakley Mon, 12/01/2008 - 08:54
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Is your phone switch on the ASA side or the PIX side? Is the phone on the PIX side?

jorjes1984 Mon, 12/01/2008 - 10:23
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Its not just 1 phone

In the HO(behind the ASA), their is an AVAYA PBX and in the branch (behind the PIX) their is an IP office(some kind of small pbx)


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