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sipwiresharktelephonyskype-for-businesscucm
Brad Reiter
Brad Reiter

Reputation: 31

Cannot make calls from Skype for business mobile clients to Cisco

I have a Skype for Business system currently deployed in my work area. Before that, we were using all the Cisco Clients and other telephony clients.

I am seeing a strange behavior, that is I am able to make calls from my Skype for Business mobile clients to my Cisco phones, but when I do reverse I cannot get the call established.

What is see is SIP status code 488 (in wire shark trace) - which is codec mismatch.

I see that an invite message from Cisco phone offers media via 0 and 101 codecs. But still not able to get the call through.

Upvotes: 0

Views: 294

Answers (1)

Kris Vanherck
Kris Vanherck

Reputation: 255

Check the path the INVITE is taking: outgoing the SfB will send the INVITE through the mediation server for audio trans-coding, but the Cisco may be attempting media bypass: trying to connect phones directly without going through the mediation server.

But this all depend on how the two are connected of-course and if a session border controller is involved or a hundred other little things.

You may want to refer to an official document: Skype for Business 2015 using SIP trunk to Cisco Unified Communications Manager Release 10.5.2 SU3

That is over 100 pages on only one method of interconnecting the two ;)

Upvotes: 0

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