...
Access the DID page as explained in DIDs (Direct Inward Dialing)
Click New DID. The Add DID dialog box appears
Enter the following information:
DNIS: The 10-digit DID created to send traffic over the SIP trunk from Metaswitch to a queue
IVR: The IVR to which the DID is pointing
Comments: A description of the DID’s purpose, and any other helpful information
Forward DID: The 10-digit number to which to forward this DID if it is not available
Click OK when done