Polycom 3725-76302-001LI manual Peer server to specific domains by adding

DMA Operations Guide External SIP Peer

Table 5-15Edit External SIP Peer dialog box

Field	Description
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.
	Select this option to enable the External Registration
	tab and configure the system to register with this
	external peer server, 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
	peer server 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 peer servers 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 peer server.
	Leave this list empty to route any call that matches the
	rule to this peer server.
	Select a domain and click Remove to remove it from
	the list.
Postliminary
Use output format	Enables dial string transformations using the To header
	and Request-URI option settings below instead of a
	customized script.
	Note: The system generates a script that implements
	the settings made in this section. To see (and perhaps
	copy) the generated script, you can temporarily select
	Use customized script.
	To help you learn how to write your own script, you can
	make different settings in this section and see how the
	generated script changes.
To header options	Specify the format of the To header in messages sent to
	this peer.

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