Specifications

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Cisco IOS Telephony Service, Version 2.02
Chapter 4 Advanced Configuration Tasks
Integrating Voice Mail
Configuring MWI Relay
MWI relay is required when one Cisco Unity Voice Mail system is shared by multiple Cisco IOS
Telephony Service routers. All Cisco IOS Telephony Service routers can to do MWI relay using the SIP
subscriber and notifier mechanism. Figure 4-7 shows a network topology with MWI relay mechanism.
The Cisco IOS Telephony Service router attached to the Cisco Unity Voice Mail system, running the SIP
MWI relay server, is the SIP notifier and the other remote Cisco IOS Telephony Service routers are the
SIP subscribers.
SUMMARY STEPS
1. telephony-service
2. mwi relay
3. mwi expires seconds
4. mwi sip-server ip-address [[transport tcp | transport udp] | [port port-number] | [reg-e164]]
DETAILED STEPS
Step 2
Router(config-ephone-dn)# number number
[secondary number]
Configures a valid number for the Cisco IP phone. The
secondary keyword allows you to associate a second
telephone number with an ephone-dn so that the IP phone
line can be called by dialing either the main or the
secondary phone number.
Note Two numbers should be set for the MWI
mechanism to work. The first number turns the
MWI light to ON and the second number turns the
MWI light to OFF when the message is picked up
by the IP phone user.
Step 3
Router(config-ephone-dn)# mwi {on | off |
on-off}
Configures specific Cisco IP phone directory numbers to
receive MWI notification from an external voice-mail
system. The MWI notification is set for all the IP phones
connected to the Cisco IOS Telephony Service router. The
external voice-mail systems are often able to communicate
MWI status by making telephone calls to dummy extension
numbers, where the MWI information is embedded in
either the called or calling party IP phone number.
Note This command cannot be configured unless the
number command is configured in ephone-dn
configuration mode.
Command Purpose
Command Purpose
Step 1
Router(config)# telephony-service
Enters telephony-service configuration mode.
Step 2
Router(config-telephony-service)# mwi relay
Enables the Cisco IOS Telephony Service router to
relay MWI information to remote Cisco IP phones.