You can try a blind transfer vs an attended transfer from the receptionist to see if that makes a difference. Generally speaking these are the factors that incoming caller ID to a Polycom can be based on:
- entries in the personal contact directory of the phone
- the FROM field of the SIP INVITE to the phone
- P-asserted identity field of the SIP INVITE to the phone
I would suggest getting a SIP debug from the Genband or a packet capture from a port mirror connected to the interface the phone is plugged into to see what is being sent.
NOTE: I moved this post to the ADTRAN-Polycom Series area
The blind transfer made it work like I wanted. Thanks!