Specifications

Setting Up Call Handling

How to Set Up Call Handling for Incoming and Outgoing Calls

Cisco Unified Survivable Remote Site Telephony Version 4.0 System Administrator Guide

Configuring Call Rerouting

Note The alias command obsoletes the default-destination command and is recommended over the

default-destination command.

The alias command provides a mechanism for rerouting calls to telephone numbers that are unavailable

during fallback. Up to 50 sets of rerouting alias rules can be created for calls to telephone numbers that

are unavailable during Cisco Unified CallManager fallback. Sets of alias rules are created using the alias

command. An alias is activated when a telephone registers that has a phone number matching a

configured alternate-number alias. Under that condition, an incoming call is rerouted to the alternate

number. The alternate-number argument can be used in multiple alias commands, allowing you to

reroute multiple different numbers to the same target number.

The configured alternate-number must be a specific E.164 phone number or extension that belongs to

an IP phone registered on the Cisco Unified SRST router. When an IP phone registers with a number that

matches an alternate-number, an additional POTS dial peer is created. The destination pattern is set to

the initial configured number-pattern, and the POTS dial peer voice port is set to match the voice port

associated with the alternate-number.

If other IP phones register with specific phone numbers within the range of the initial number-pattern,

the call is routed back to the IP phone rather than to the alternate-number (according to normal dial-peer

longest-match, preference, and huntstop rules).

Call Forward Destination

The cfw keyword allows you to configure a call forward destination for calls that are busy or not

answered. Call forward no answer is defined as when the phone rings for a user configurable amount of

time, the call is not answered, and is forwarded to the configured destination. Call forward busy and call

forward no answer can be configured to a set string and override globally configured call forward

settings.

Note Globally configured settings are selected under call-manager-fallback and apply to all phones that

You can also create a specific call forwarding path for a particular number. The benefit of using the cfw

keyword is that during SRST, you can reroute calls from otherwise unreachable numbers onto phones

that are available. Basic hunt groups can be established with call-forwarding rules so that if the first

SRST phone is busy, you can forward the call to a second SRST phone.

The cfw keyword also allows you to alias a phone number to itself, permitting setting of per-phone

number forwarding. An example of aliasing a number to itself follows. If a phone registers with

extension 1001, a dial peer that routes calls to the phone is automatically created for 1001. If the

call-manager-fallback dial-peer preference (set with the max-dn command) for this initial dial peer is

set to 2, the dial peer uses 2 as its preference setting.

Then, use the alias command to alias the phone number to itself:

alias 1 1001 to 1001 preference 1 cfw 2001 timeout 20