Polycom realpresence 1800 Administrator's Manual page 1062

The deployment architecture includes:
Company A
For a full description of Company A's deployment, see
Infrastructure.
Differing or additional configuration requirements for each element of this deployment model are listed
below:
Company A Solution Architecture Components
Component
CISCO Equipment
CUCM
Polycom Equipment
Collaboration Server
Company B
Company B Solution Architecture Components
CISCO Equipment
Endpoints
Polycom®, Inc.
Version Description
8.5 Cisco Unified Communication Manager:
CUCM must be configured with a SIP trunk to the Service Provider's
SBC.
7.6.x and up MCU:
Collaboration Server must be configured to send and receive RTP
streams to and from the Service Provider's SBC.
Endpoints should register with the Service Provider's CUCM (or the
local CUCM, if present).
Appendix I - Polycom Open Collaboration Network (POCN)
Single Company Model - Polycom and Cisco
1031