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Voice Software Enhancements for the Cisco 1750 and Cisco 1751 Routers

OL-1671-01

Supported Features

DID on VIC-2DID Port

This feature provides Direct Inward Dialing (DID) support on the Cisco 1751 router with the VIC-2DID

hardware.

DID is a service offered by telephone companies that enables callers to dial directly to an extension on

a Private Branch Exchange (PBX) without the assistance of an operator or automated call attendant. This

service makes use of DID trunks, which forward only the last three to five digits of a phone number to

the PBX. If, for example, a company has a PBX with extensions 555-1000 to 555-1999, and a caller dials

555-1234, the local CO would forward 234 to the PBX. The PBX would then ring extension 234. This

entire process is transparent to the caller.

When this feature is configured, a voice-enabled Cisco 1751 router can receive calls from a DID trunk

and connect them to the appropriate extensions.

Restrictions

The DID feature can be configured with the following restrictions:

• Dial tone is not present on DID voice ports.

• Outgoing calls are not allowed on DID voice ports. If an outgoing call is attempted, the caller will

get a fast busy signal.

Prerequisites

The following hardware, software, and basic configurations are required to support DID:

• Install the required IOS software on the router.

• Obtain DID service from your service provider.

• Establish a working network.

• Complete your company’s dial plan.

• Establish a working telephony network based on your company’s dial plan:

• Install the VIC-2DID cards. For more information about VIC-2DID cards, see Update to Cisco WAN

Interface Cards Hardware Installation Guide.

• Install at least one other WAN interface card to provide the connection to the LAN or WAN.

Configuring Voice Ports to Support DID

Follow these steps to configure voice ports for DID. Not all commands required to configure voice ports

appear here. Use the reference information in the “Related Documents” section on page 1 to find out

more about voice-port configuration.

Command Purpose

Step 1

Router> enable

Enter exec mode.

Step 2

Router# configure terminal

Enter global configuration mode.

Step 3

Router(config)# voice-port

slot/port

Enter voice-port configuration mode on a Cisco 1751 router.

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