External SIP Peer Device Management
Polycom, Inc. 111
Type For a Microsoft Office Communications Server or Lync
Server 2010, select Microsoft. Otherwise, select Other.
Selecting Microsoft implicitly adds the Destination
network value to the Domain List (if not already there)
and automatically selects the Postliminary settings that
are correct for most deployments with Lync Server
2010, but you can modify them if necessary.
Transport type The transport protocol to use when contacting this SIP
peer. The default is UDP.
Auto detect tells the system to select the protocol using
DNS as specified in RFC 3263, and is not valid if Next
hop address is a numeric IP address instead of a
host/domain name.
Downgrade If selected, and if this peer doesn’t support TLS, the
system can change the Request-URI schema from sips
to sip and route the call to this peer.
If not selected, the system routes a TLS call to this peer
only if this peer supports TLS.
Register externally Some external SIP peers require peers to register with
them as an endpoint does, using a REGISTER
message (also referred to as pilot registration).
Select this option to enable the External Registration
tab and configure the system to register with this
external SIP peer, following the rules specified in
RFC 3261.
Domain List If your dial plan uses a rule to apply the Resolve to
external SIP peer action, you can restrict calls to this
SIP peer to specific domains by adding the authorized
domains to this list.
If this list is empty, all domains can resolve to this peer.
Note: In some circumstances (depending on network
topology and configuration), dialing loops can develop if
you don't restrict SIP peers to specific domains.
Add new domain Enter a domain and click Add to add it to the list of
authorized domains.
Authorized domains List of administrative domains, contained in the dial
string, for which calls are routed to this SIP peer.
Leave this list empty to route any call that matches the
rule to this SIP peer.
Select a domain and click Remove to remove it from
the list.
Table 5-14 Add External SIP Peer dialog box
Field Description