Hello Murali,
welcome to the Polycom Community.
It is always useful to include the currently used software version as issues experienced may already be addressed in a newer release.
This also allows yourself and others to check against current software release notes.
The above is also stated in the "Read First: Welcome to the Polycom VoIP Forum"
Therefore the Polycom VoIP FAQ contains this post here:
Question: How can I find out my SIP UC Software Version or the BootROM Version of my Phone?
Resolution: Please check here
In addition are you dialing these number on hook or off hook ?
You may want to look at our Polycom® UC Software in a Microsoft® Lync™ Server Environment document => here <=
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services
Hello Murali,
a little more detail how you setup the phone would be interesting.
Usually all that is needed is a factory reset phone and then set to LYNC base profile (if not ordered as LYNC SKU) already and then simply import a certificate (if a private certificate is being used) when using Single Sign in or use Pin & Extension.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services