Polycom RealPresence 1800 Administration Manual page 404

Company A Solution Architecture Components
Component
CISCO Equipment
CUCM
Polycom Equipment
Collaboration Server
Company B
Company B Solution Architecture Components
Component
CISCO Equipment
Endpoints
Call Flow - Multipoint Call via Service Provider
Model 2
In this example:
● Collaboration Server prefix in the gatekeeper: 72
● Virtual Meeting Room in DMA: 725123
● CUCM: According to its Dial Plan forwards calls with prefix 72 to the Collaboration Server
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.
Version Description
Endpoints should register with the Service Provider's CUCM (or the
local CUCM, if present).
Appendix - Polycom Open Collaboration Network (POCN)
383