Appendix H - Integration Into Microsoft Environments
Polycom®, Inc. 710
Conferencing Entities Presence
Conferencing entities (Meeting Rooms, Entry Queues and SIP Factories) can be registered with the SIP
server (Office Communication Server or Lync server) enabling the addition of these conferencing entities to
the buddy list while displaying their presence (availability status: Available, Offline, or Busy). Office
Communication Server client or Lync Server client users can connect to conferencing entities directly from
the buddy list.
The configuration of the environment to enable Presence, is usually done once the basic configuration is
completed.
For more details, see Adding Presence to Conferencing Entities in the Buddy List.
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 Collaboration Server 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). A DNS server can be specified for each IP Network Service and for the
RMX Management Network Service.
Collaboration Server Multiple Networks Topology
Guidelines
●If ICE initialization fails in a Network Service:
The Network Service remains functional but without ICE capability.
ICE capability on media cards that share the same Network Service also remain functional but
without ICE capability.
Other Network Services with ICE capability on other media cards are unaffected.
●A DNS server can be specified for each IP Network Service and for the Collaboration Server
Management Network Service.
Interactive Connectivity Establishment (ICE)
Interactive Connectivity Establishment (ICE) provides a structure/protocol to unify the various NAT
Traversal techniques that are used to cross firewalls.
It enables SIP based endpoints to connect while traversing a variety of firewalls that may exist between the
calling endpoint (local) and the MCU or called endpoint (remote). It is the only way for remote Microsoft
Office Communicator/Lync users to call into the enterprise without a VPN.

ICE Guidelines

●Collaboration Server ICE implementation complies with Microsoft ICE implementation.
●ICE is available only in IPv4 environment.
●ICE can be implemented in an environment that includes a STUN server and a Relay server (for
example, Microsoft AV Edge server).
●The firewall must be UDP enabled.