The MSDN documentation lists all the URIs of the schema and parameters that you can pass.
For Lync 2010 you can use:
Lync: //
For Lync 2013, you can use any of the following:
Tel: +14255550101 â Only opens a telephone connection with +14255550101.
Callto: tel: + 14255550101 â Opens viewing only from the phone +14255550101.
Callto: sip: name@example.com â Only opens browsing from the phone with the name@example.com
sip: name@example.com â Opens a dialog with the name@example.com
conf: sip: https://meet.contoso.com/name/7322994
Details can be found on MSDN here.
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