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Sniffing with Wireshark I can see that an inbound INVITE from our PSTN sip trunk contains a history-info header, but this header is not forwarded to our endpoint application server where I want to pick it up.

The sip logs on the mediation server does not show the history-info header, so it seems that the Lync 2015 mediation server is tampering with the INVITE requests from the PSTN trunk even before it is logging inbound sip messages.

I have read that Lync 2013 does not support inbound history-info headers, Reference: History-info Inbound is not supported, but am hoping that this does not hold true for 2015.

Is it possible to configure Lync 2015 to forward the history-info header from inbound invites or are they not supported at all?

MatiasK
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2 Answers2

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Unfortunately i have come across the same problem previously and i found that it is still not supported, i cannot provide a link though as this was some time ago.

Dewi Jones
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It seems that the history-info header is only supported in one direction, outbound to PSTN. This is documented here Lync Server 2013: Headers for SIP Trunking.

On page 6 we read • History-info Inbound is not supported. The Mediation Server will not forward any received History-Info headers

MatiasK
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