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 include if you are using a SIP server or a LYNC / Skype for Business server.
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
Once we know what kind of SIP switch you are using we may be able to comment.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Polycom Global Services
Thanks for replying.
It will be the UC-One system from Broadsoft.