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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#404040">According to the RFC, the Allow-Events header is specifically used to convey events that a UA can support using the SUBSCRIBE method. Typically we’ll see KPML
or Presence as a supported Allow-Event value, which makes sense since both of those events are initiated through SUBSCRIBE/NOTIFY transactions. I’m looking through sets of trace files where I know RTP-NTE is negotiated and have found multiple instances where
DTMF was negotiated successfully (to RTP-NTE) without including telephone-events in the Allow-Events header.
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#404040">What type of issues are you seeing with ReINVITEs?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#404040"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> cisco-voip [mailto:cisco-voip-bounces@puck.nether.net]
<b>On Behalf Of </b>Ed Leatherman<br>
<b>Sent:</b> Friday, July 08, 2016 9:18 AM<br>
<b>To:</b> Cisco VOIP <cisco-voip@puck.nether.net><br>
<b>Subject:</b> [cisco-voip] SIP protocol question<o:p></o:p></span></p>
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<p class="MsoNormal">Happy Friday!<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">This is probably a dumb basic question but my google-fu is failing me. <o:p></o:p></p>
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<p class="MsoNormal">What exactly is the "telephone-event" event package used for in the allow-events: header? Must it be present?<o:p></o:p></p>
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<p class="MsoNormal">I have been assuming it had to do with rtp-nte but that seems wrong since that's negotiated in the SDP.<o:p></o:p></p>
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<p class="MsoNormal">I'm trying to integrate with our associated Medical Center with a SIP Trunk out of CUBE (IOS 15.4(3)M3) - they are running a mish-mash of Siemens PBX/SIP/Call Center stuff on their end. I'm having some weird stuff happen with reinvites
when their system(s) transfer the call around and I'm trying to nail down everything I find that i'm not sure of... in one of the transactions the telephone-event is missing out of the allow-events in the invite.<o:p></o:p></p>
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<p class="MsoNormal">Thanks!<o:p></o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal">Ed Leatherman<o:p></o:p></p>
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