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Today's Topics:
1. Hairpin Call from certain PBXs - No Audio issue (Ujjval Karihaloo)
----------------------------------------------------------------------
Message: 1
Date: Thu, 9 May 2013 22:29:30 -0600
From: Ujjval Karihaloo <[email protected]>
To: [email protected]
Subject: [VoiceOps] Hairpin Call from certain PBXs - No Audio issue
Message-ID: <[email protected]>
Content-Type: text/plain; charset="windows-1252"
Hi Team:
Have you all seen issues with hairpin calls from PSTN? ITSP
(Broadsoft/ACME)? SIP Trunk ? which in turn forwards the call back out the
SIP trunk to the PSTN and there is no Audio in either direction (Transfer
via Auto-attendant OR Blind ? Attended Xfer works as Media is
anchored/reinitiated on PBX)
Having worked on a few PBXs (Allworx, Zultys) that cause this issue on
ACME/Broadsoft Sip trunk setup ? we see RTP in both direction on our
traces, but due to the pass through RTP nature of this call flow, the TTL
get way down to 5-6 in some cases, and that is what I believe is the issue,
and our upstream vendors like Level3, Bandwidth etc suggest the same.
Other than implementing a RTP repeater of sorts, I don?t see an
alternative. Ideas appreciated
Thx
Ujjval
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