Hello Joseph T,
welcome to the Polycom Community.
I have moved your post as it is unrelated to the one you replied to.
The original post you replied to and the community's VoIP FAQ contains this post here:
May 04, 2016 Question:Are there any known VVX D60 Wireless Handset Limitations?
Resolution: Please check => here<=
The above states as an example that share lines are not supported. As you have so far not provided any kind of details on the lines you use on your phone it would be hard to comment.
You can attach a backup if you want but it may be easier to open a support ticket.
In order to raise a support ticket you need to work with your Polycom reseller as they need to do this for you. In case this is some sort of an Internet discounter please post your phone's MAC address so I can look up who would be able to support you.
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