Hello jgranade,
that is an completely unsupported scenario.
Jan 25, 2016 Question:How many Lines can I register using Polycom phones with Lync Server / Skype for Business server ?
Resolution: You can register only one line when Lync is set as the base profile on the phone.
If you are using Lync you must use LYNC base profile.
Anything else we cannot help you with.
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
