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Call completed elsewhere

Webex is missing a SIP feature described in RFC3326 section 3.1


When a forked call is picked up by a device, other devices receive a CANCEL Request with The Sip header "Reason:SIP;text="Call completed elsewhere";cause=200" in the content. UC-One but also Hardphones cancels the session while ringing and don't register the call as being missed. Webex however cancel the session and registers the call as a missed call inspite of the Reason Header.


This affects The Webex app in a Huntgroup, CallCenter, Broadworks Anywhere, Shared Call Appearance, Simultanious ring and other forked call scenario's.


I suggest that Webex does process the Sip Header and when it occurs in a CANCEL request the call is not registered as a missed call.


Code Sample SIP CANCEL Request:


CANCEL sip:102@10.16.145.5 SIP/2.0

Via:SIP/2.0/UDP 10.16.145.3;branch=z9hG4bKBroadWorks.16smkct-

10.16.145.5V5060-0-146434168-1571676787-1374682403054-

From:"John Q.

Public"<sip:2145550000@initech.test;user=phone>;tag=1571676787-

1374682403054-

To:"Dom Portwood"<sip:102@initech.test>

Call-ID:BW111323054240713-1896647299@10.16.145.3

CSeq:146434168 CANCEL

Reason:SIP;text="Call completed elsewhere";cause=200

Max-Forwards:10


Thanks and kind regards,

Misja Hoen


  • Guest
  • Jan 19 2022