welcome to the Polycom Community.
It is always useful to include the currently used SIP or UC Software version as issues experienced may already be addressed in a newer release.
Please also include if you are using a SIP server or a LYNC / Skype for Businessserver
In addition it may be helpful to specify the Polycom Phone you are using.
This also allows yourself and others to check against current software release notes.
The above is also stated in the "Read First"
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
Also check here:
Oct 25, 2011 Question: How can I change my Ringtone or Ring in a special manner for a certain incoming call?
Resolution: Please check => here <=
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Polycom Global Services