Hello blueicedj,
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 server
If LYNC or Skype please provide Version details and if these are on premise of off premise
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
and most likely for your actual issue:
Oct 7, 2011 Question: Phone unable to Dial a number when Off Hook or on 2nd Call in a Conference
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