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CSTA session starting, but no events


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I am trying to get CSTA working on a hosted SnomOne platform. The session connects ok. For brevity, here is the PBX response:

<?xml version="1.0" encoding="UTF-8"?><StartApplicationSessionPosResponse xmlns="http://www.ecma-international.org/standards/ecma-354/appl_session" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><sessionID>df3e4yobdsjfczasheyq</sessionID><actualProtocolVersion>http://www.ecma-international.org/standards/ecma-323/csta/ed4</actualProtocolVersion><actualSessionDuration>60</actualSessionDuration></StartApplicationSessionPosResponse>

Also the monitor start works ok:

<?xml version="1.0" encoding="UTF-8"?><MonitorStartResponse xmlns="http://www.ecma-international.org/standards/ecma-354/appl_session" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><monitorCrossRefID>428</monitorCrossRefID><actualMonitorMediaClass><voice>true</voice><im>true</im></actualMonitorMediaClass></MonitorStartResponse>

But I never get any events when the handset makes calls. I have tried a number of clients, include Snom Browser and the TPAI driver, but none of them get any events. The trace above is actually taken from Wireshark from the TAPI driver.

 

I presume that it must be a PBX configuration issue, but don't know where to start. Please can you give me some pointers?

 

 

Also of interest, the "ResetApplicationSessionTimer" command is returning errors. Request:

<ResetApplicationSessionTimer xmlns="http://www.ecma-international.org/standards/ecma-354/appl_session/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><sessionID>df3e4yobdsjfczasheyq</sessionID><requestedSessionDuration>1800</requestedSessionDuration></ResetApplicationSessionTimer>

Response:

<?xml version="1.0" encoding="UTF-8"?><CSTAErrorCode xmlns="http://www.ecma-international.org/standards/ecma-323/csta/ed4"><operation>invalidSessionID</operation></CSTAErrorCode>
But if the "ResetApplicationSessionTimer" command is not sent, then the session disconnects, so it must be doing something.
Also, the Log is showing CSTA information, but I never receive it. For instance:
[8] 2014/09/11 14:34:01: CSTA: leg=725186, device=8514@xxxremoved, inbound=true, Calling=8514@xxxremoved, Called=59674566@standardsolar.telegate.net.au, State=ringback, CallID = MTExNTcxOGM0ZjU2NmZlMjkwYWNhMWFkZDMxZDUxMzQ
Please can you help me work out what I need to change (on the PBX)?
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