Hi LMSU,
Agree with Muralidharan.R.
As a supplement, for SFB and skype integration, you need to register Public Instant Messaging Connectivity(PIC).
This provisioning process can take up to thirty days to complete. If the Provisioning is finished, you'll get a notification mail from Microsoft.
You need also make sure that port 5061 and 4443 open.
Hope this helpful to you.
Alice Wang
TechNet Community Support
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