Mapping dial strings to SIP endpoints

When you configure SIP trunking, you will define routes that map each device's dial string to its designated SIP endpoint, and rules that define how that mapping works. When a user dials a string to initiate a call, the routing rules are consulted and if a matching dial string format is found, the call is routed to the associated SIP endpoint, which in turn directs the call to the corresponding telephone or device. Create a table like the one shown here, where you specify a dial string pattern, the name of the SIP endpoint that services calls matching that pattern, and the name of the end-user device that receives the call; this will help you define routes and routing rules.

The dial string specifies a pattern that the user must exactly match when initiating a call to a particular device. In the dial string, each "X" represents exactly one digit from 0 through 9. For example, if you use the mapping shown in the table, 514XX means that the Sametime® user could dial 514[0-9][0-9] and this five-digit number would route to the Avaya Session Manager and from there be directed to a user's Avaya desk phone.