Using Dial Plan Tags for Matching Routing Rules

For deployments requiring hundreds of routing rules (which may exceed the maximum number of rules that can be configured in the IP-to-IP Routing table), you can employ tags to represent the many different calling (source URI user name) and called (destination URI user name) prefix numbers in your routing rules. Tags are typically implemented when you have users of many different called and/or calling numbers that need to be routed to the same destination (e.g., IP Group or IP address). In such a scenario, instead of configuring many routing rules to match all the required prefix numbers, you need only to configure a single routing rule using the tag to represent all the possible prefix numbers.

An example scenario where employing tags could be useful is in deployments where the device needs to service calls in a geographical area that consists of hundreds of local area codes, where each area code is serviced by one of two SIP Trunks in the network. In such a deployment, instead of configuring hundreds of routing rules to represent each local area code, you can simply configure two routing rules where each is assigned a unique tag representing a group of local area codes and the destination IP Group associated with the SIP Trunk servicing them.

● Source and destination tags can be used in the same routing rule.
● The same tag can be used for source and destination tags in the same routing rule.
➢ To configure IP-to-IP routing based on tags:
1. In the Dial Plan table, configure a Dial Plan (see Configuring Dial Plans). For example, the Dial Plan file below defines two tags, "LOC" and "INTL" to represent different called number prefixes for local and long distance (International) calls:

2. For the IP Group or SRD associated with the calls for which you want to use tag-based routing, assign the Dial Plan that you configured in Step 1.
● IP Groups table: 'Dial Plan' parameter - see Configuring IP Groups
● SRDs table: 'Dial Plan' parameter - see Configuring SRDs
3. In the IP-to-IP Routing table (see Configuring SBC IP-to-IP Routing Rules), configure a routing rule with the required destination and whose matching characteristics include the tag(s) that you configured in your Dial Plan in Step 1. The tags are assigned under the Match group, using the following parameters:
● 'Source Tags': tag denoting the calling user
● 'Destination Tags': tag denoting the called user