Force Web App URL

The normal operation for a PC with a Lync client installed when the user clicks on the meeting URL, is for Lync client to be launched.  There may be times when you want to see the web options for joining a meeting. 

This is where the "?sl=1" can be very helpfull.

The normal web url for meeting is something like:

https://meet.<domain name>/<username>/<meeting id>

Just append the ?sl=1 to the end on the <meeting id>.

https://meet.<domain name>/<username>/<meeting id>?sl=1

Depending on what your the "Security > Web Service" configuration is you may see the following screen shot.