Polycom 1500 Administrator's Manual page 1072

RealPresence Collaboration Server (RMX) 1500/1800/2000/4000 Administrator's Guide
The Default IP Service - Networking IP dialog box opens.
4 Make sure the IP Network Type is set to H.323 & SIP even though SIP will be the only call setup
used with Office Communications Server 2007.
5 Make sure that the correct parameters are defined for the Signaling Host IP Address, Media Card 1
IP Address, Media Card 2 IP Address (RealPresence Collaboration Server (RMX) 2000/4000 if
necessary), Media Card 3 IP Address (RealPresence Collaboration Server (RMX) 4000 if
necessary), Media Card 4 IP Address (RealPresence Collaboration Server (RMX) 4000 if
necessary) and Subnet Mask.
Make sure that the IP address of the Collaboration Server Signaling Host is the same one defined as
a trusted host in Office Communications Server 2007/Lync Server 2010.
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