Error connecting to a S4B and CMS Dual Homed Call

When attempting to Join a Microsoft Skype meeting the call from a Cisco Endpoint fails, a point to point however does not, looking at the logs it suggests that it cannot find the conference “meet.alictrify.com/joe.microsoft/2h2g6c6r” not found

2018-06-19 12:53:27.669 Info 2000 log messages cleared by “admin”
2018-06-19 12:53:34.558 Info call 16: incoming encrypted SIP call from “sip:dx80@alictrify.com” to local URI “sip:meet.alictrify.com/joe.microsoft/2h2g6c6r@alictrify.com”
2018-06-19 12:53:34.625 Info lync conference resolution: C3p query error
2018-06-19 12:53:34.626 Info lync conference resolution: conference “meet.alictrify.com/joe.microsoft/2h2g6c6r” not found
2018-06-19 12:53:34.626 Info forwarding call to ‘sip:meet.alictrify.com/joe.microsoft/2h2g6c6r@alictrify.com’ to ‘meet.alictrify.com/joe.microsoft/2h2g6c6r@alictrify.com’
2018-06-19 12:53:34.629 Info call 17: outgoing SIP call to “meet.alictrify.com/joe.microsoft/2h2g6c6r@alictrify.com” (Lync)
2018-06-19 12:53:34.652 Info call 17: ending; remote SIP teardown with reason 18 (not found) – not connected after 0:00
2018-06-19 12:53:34.653 Info call 16: ending; local teardown – not connected after 0:00

Since we are attempting to join a Lync Meeting and not a gateway call which would be converted to MS-SIP, CMS needs to convert the user portion of the URI into an HTTPS target and try to find an Office365 meeting hosted at that URL. This is achieved by setting the SimpleJoin to be enabled and set to Yes.

Once configured, the resolution will work and this will now show up as:

2018-06-19 13:23:24.749 Info lync simplejoin resolution: successfully completed
2018-06-19 13:23:24.754 Info call 34: outgoing SIP call to “joe.microsoft@alictrify.com;gruu;opaque=app:conf:focus:id:2h2g6c6r” (Lync focus)
2018-06-19 13:23:24.758 Info call 33: setting up UDT RTP session for DTLS (combined media and control)
2018-06-19 13:23:24.785 Info conference “Lync conference meet.alictrify.com/joe.microsoft/2h2g6c6r”: unencrypted call legs now present
2018-06-19 13:23:24.790 Info call 34: SIP call ringing
2018-06-19 13:23:24.826 Info call 35: outgoing SIP call to “joe.microsoft@alictrify.com;gruu;opaque=app:conf:focus:id:2h2g6c6r” (Lync conference subscription)
2018-06-19 13:23:24.861 Info call 36: outgoing SIP call to “Joe.Microsoft@alictrify.com;gruu;opaque=app:conf:audio-video:id:2H2G6C6R” (Lync)
2018-06-19 13:23:24.862 Info call 37: outgoing SIP call to “Joe.Microsoft@alictrify.com;gruu;opaque=app:conf:chat:id:2H2G6C6R” (Lync IM)

This shows that the Lync Focus which is responsible for enforcing the Conference Control Policy,  Lync Conference Subscription, Audio / Video, Lync IM setup completes successfully for Skype Meeting ID 2h2g6c6r

in CMS you can also see the same channels setup in the active calls:-

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