To allow calls to be routed from the Lotus Sametime Unified Telephony to the correct gateway additional EPs (Endpoints) need to be created for each SIP Gateway (PSTN (Public Switched Telephone Network) gateway) in a branch.
Gateways may register dynamically or be statically registered.
Support for SIP GW's behind the Branch do not necessary require assignment of an IP address for a SIP EP used as an alias for the GW. It is possible to share the same EP used for routing requests towards branch users. The starting point for such a configuration is the Proxy or Branch configuration. For the SIP GW's which register dynamically, an EP is used to support the registration but does not necessary require assignment of an IP address provided an alias is identified for the EP and is trusted. not always required. In some cases it is possible to share the same Proxy EP used for routing requests towards branch users.
If the SIP GW requires static registration a unique EP with address associated with SBC core is created. The EP should be configured with an alias name corresponding to the User Name configured in the gateway. The SIP Proxy and Route via Proxy attributes are not required for this EP.
If the SIP GW supports survivability the SIP EP "Survivable Endpoint" should be enabled.
Branch gateway EPs can be associated with an SIP EPP (Endpoint Profile) in order to enable services such as:
Incoming name deliveryParent topic: SBC (Session Border Controller)
Called name/number delivery
Call Forward Invalid Destination