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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal">Hi Team:</p><p class="MsoNormal"> </p><p class="MsoNormal"> </p><p class="MsoNormal"> Have you all seen issues with hairpin calls from PSTN<span style="font-family:Wingdings">ŕ</span> ITSP (Broadsoft/ACME)<span style="font-family:Wingdings">ŕ</span> 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)</p>
<p class="MsoNormal">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.</p>
<p class="MsoNormal"> </p><p class="MsoNormal">Other than implementing a RTP repeater of sorts, I don’t see an alternative. Ideas appreciated</p><p class="MsoNormal"> </p><p class="MsoNormal">Thx</p><p class="MsoNormal">Ujjval</p>
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