LBR is a set of rules that modifies the routing of nation and international PSTN calls to prevent toll bypass. It provides the flexibility to apply these rules to specific region, gateway or set of users.
Restrictions LBR can enforce
Restrictions LBR can enforce
- Outgoing calls - LBR can enforce the outgoing calls to go out from a PST gateway that is located in the same region where the caller is located to prevent PSTN toll bypass.
- Incoming calls - LBR can prevent incoming PSTN calls to Lync end points if the PSTN gateway routing this call is from different region where the called person is located.
- Unknown regions - LBR restricts the incoming and outgoing PSTN calls to and from users who are located in the undetermined region i.e remote users connecting from the internet
- Internation regios - LBR can enforce the outgoing calls through international PSTN gateways, if the location where the caller is not having any gateway
To apply routing restriction to prevent tool bypass, LBR leverages network regions, sites and subnets. User's location is determined by the IP subnet of the Lync end points are connected to.
Voice routing policies can be applied on a network site basis to define PSTN gateway that should be used by all users for a site to make PSTN calls. Voice policies applied to a site with LBR enabled will take precedence over a policy assigned to user level .
When a Lync user places a PSTN call, the user’s voice policy determines whether the user can be authorized to place the call. If the user’s voice policy allows the user to place the call, Location-Based Routing determines which PSTN gateway the call should egress from. Location-Based Routing makes this determination based on the user’s location.
Sample LBR setup |
Incoming PSTN Calls
All incoming PSTN calls through “Site 1 Gateway” will only be allowed to route to endpoints located in site 1. For example, when “Lync user 1” travels to site 2, all incoming PSTN calls through “Site 1 Gateway” will not be routed to “Lync user 1” endpoints located in site 2. The same routing rule applies if “Lync user 1” travels to an unknown network site where the user’s location can’t be determined.
Outgoing PSTN Calls
When a user is located in a network site configured for Location-Based Routing, the network site’s Voice Routing Policy route overrides the user’s Voice Policy route. This rule is particularly useful for users that temporarily move to a different site. In this particular case a user will always use a gateway that is local to his location; if “Lync user 3” is located at “Site 2”, all his outbound calls will be routed via “Site 2 Gateway”, but if he travels to site 1, all his outbound calls placed while he’s at site 1 will be routed through “Site 1 Gateway”.
Call Transfers and Forwards
The following table illustrates how Location-Based Routing affects how the call is routed based on the location of the Lync user being transferred (Lync user 2, Lync user 4, etc) to a PSTN endpoint
The following table depicts Lync user 1 transferring or forwarding a PSTN call to another Lync user.
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