Question: How do I use the paging or intercom feature on the GXP Series?
Answer:

For GXP20xx, on the Client side, the following two fields (Account Page) need to be set to Yes.
Allow Auto Answer by Call-Info.
Turn Off speaker on Remote disconnect.
For GXP21xx/GXP14xx, on the Client side, the following field (Accoung Page) needs to be set to Yes..
Allow Auto Answer by Call-Info.
Note: The PBX Server has to support this feature to make it work.