Specifications

4-13
Cisco IOS Telephony Service, Version 2.02
Chapter 4 Advanced Configuration Tasks
Integrating Voice Mail
In Figure 4-7, Router 1 is the central site Cisco IOS Telephony Service router—the MWI notifier—and
uses the MWI integration mechanism described earlier to interface with the Cisco Unity Voice Mail
system. The Cisco IP phone directory numbers on Router 2 and Router 3 register with Router 1 by using
the Session Initiation Protocol (SIP) subscriber mechanism. Router 1 as the SIP notifier recognizes the
Cisco IP phone directory numbers associated with Router 2 and Router 3 to relay MWI.
Figure 4-7 Network with MWI Relay
MWI Relay Mechanism
The MWI relay mechanism is initiated after someone leaves a voice-mail message on the remote
voice-mail message system. In the network topology in Figure 4-7, the following events take place:
1. The Cisco IP phone with the extension 5001 receives a call and the call is not answered.
2. The Cisco IP phone with the extension 5001 forwards the call to the voice-mail access port 4001.
3. The Cisco Unity Voice Mail system (extension 4001) stores the new message for extension 5001.
4. Cisco Unity Voice Mail then places an MWI notification call to the MWI processing ephone-dn 8000
(through the MWI access port 4002) to the central Cisco IOS Telephony Service router, Router 1,
with the calling party ID for the notification as extension 5001.
5. Router 1, acting as the SIP notifier, relays MWI notification to Router 3, one of the SIP subscribers.
6. Router 3, the local Cisco IOS Telephony Service router for extension 5001, turns the MWI light to
ON on the Cisco IP phone 5001.
To configure the MWI mechanism, perform the following tasks:
• Configuring the SIP-Based MWI Server, page 4-14
• Configuring MWI for Each Directory Number, page 4-14
• Configuring a Directory Number for MWI Notification, page 4-15
• Configuring MWI Relay, page 4-16
IP
IP
10.9.24.25
10.8.17.25
10.10.12.1
6001
IP
5001
Router 3
5001-5025
Router 2
6001-6025
Router 1
2001-2049
IP
2001
4001
Voice mail
62702
V
V
V