Hello bioassayworks,
welcome to the Polycom Community.
Paging / PTT is one to many and you can select which phone should "listen" to what channel
Its described here:
Jan 21, 2014 Question: How can I use PTT / Push To Talk / Paging / Page ?
Resolution: Please check => here <=
What you are most likely after is this:
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.
Best Regards
Steffen Baier
Polycom Global Services