Utilizing DIDs
A DID (Direct Inward Dialing) is a method that allows companies to own large blocks of telephone numbers that can be allocated to system users or services. DID services are most commonly used with digital circuits such as T1/E1/PRIs but may be available in certain areas on other circuit types.
Just before a call rings in on one of the available channels, the phone number that was dialed is transmitted. T1/E1/PRI gateways that are connected to the sipXecs PBX should then be configured to forward the dialed number to <DID@sip.domain>
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Routing the call to a particular user is easily accomplished by adding the DID as an alias on the user account or auto attendant that owns that DID. If the DID is to be used to access other resources on the PBX, consider using a phantom user as shown in the next section.