Skype4BClient Meeting Delay

I installed the Skype for Business Client Preview a few weeks ago and finally had time to test the new client.

I performed some functional tests on the new product and noticed a certain delay when joining a meeting.
The following screen is displayed for approximately 45 seconds.

Wait1

After those 45 seconds, the Skype for Business conferencing pane is displayed, and I was able to add media modalities.

Wait2

I opened the same Meeting URL with the Lync 2013 client, and there was no delay.

I decided to do some SIP tracing, first the Lync 2013 client:

trace_LC2013

Then the Skype for Business client:

trace_S4BCOld

As you can see in the Lync 2013 client trace, the time between the outgoing ‘invite’ and the incoming ‘dialog created’ is less than a second.
In the Skype4B client trace, the difference is approximately 40 seconds.

We know that the Lync BackEnd environment is functional, the Lync 2013 client does not experience this behavior.

I checked for the installed Lync updates: KB2889923 was installed. This update holds the Skype for Business client.
I checked other PC’s with the KB installed and noticed that some clients with the Skype4B client installed did not experience this behaviour.

Time to do some version checking, first the ‘ faulty’ client:

S4BC_OldVersion

As you can see: 15.0.4707.1000 – 15.0.4707.1000

Then the ‘working’ client:

S4BC_NewVersion

A new (!!) version: 15.0.4711.1002 – 15.0.4711.1000

So, although both PC’s show the same KB as installed, the versions are different.
Research learned; the ‘faulty’ PC’s got their Skype client from the preview program, the ‘ working’ ones from the regular windows (Office) updates.

I downloaded the KB2889923 hotfix, installed it and presto (said the Alien) the delay disappeared.

trace_S4BCNew

(ps; I love the animated emoticons added to the Skype4B Client ;))

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