I have the same problems but I can not resolved, Is possible to know who you was resolved the problem
welcome to the Polycom Community.
It is always useful to include the currently used UC Software version as issues experienced may already be addressed in a newer release.
Please also state what phone you are using and what you have tried so far.
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
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Polycom Global Services