Polycom RMX 1500 Administrator's Manual page 971

Chapter H-Setting the RMX for Integration Into Microsoft Environment
Multiple Networks
A more complex configuration, in which two Microsoft SIP servers are
used (one Lync Server and one Office Communications Server) is also
supported using the RMX Multiple Networks configuration.
In this configuration, each Microsoft SIP Server is defined in a Network
Service of its own (in this case two IP Network Services are defined). Only
one DNS server can be used for all the RMX Network Services, and it
must be defined in one of the signaling Network Services.
One IP Network Service is defined as described for a single Network
Service in the Microsoft environment.
The second Network Service is defined without a DNS server, using the
IP address of the Microsoft SIP Server (Lync or OCS server, depending on
the server defined in the first Network Service) instead.
Figure H-1 RMX Multiple Networks Topology
ICE is not supported with this configuration.
For more details about Multiple Networks configuration, see "Multiple
Network Services" on page 14-59.
H-3