Specifications

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Cisco Unified Survivable Remote Site Telephony Version 4.0 System Administrator Guide
Integrating Voice Mail with Cisco Unified SRST
This chapter describes how to make your existing voice-mail system run on phones connected to a
Cisco Unified (SRST) router during Cisco CallManager fallback.
Note Prior to version 4.0, the name of this product was Cisco SRST.
Note The Cisco IOS Voice Configuration Library includes a standard library preface, a glossary, and feature
and troubleshooting documents and is located at
http://www.cisco.com/en/US/products/ps6441/prod_configuration_guide09186a0080565f8a.html.
Contents
• Information About Integrating Voice Mail with Cisco Unified SRST, page 147
• How to Integrate Voice Mail with Cisco Unified SRST, page 149
• Configuration Examples, page 161
• Where to Go Next, page 163
Information About Integrating Voice Mail with Cisco Unified
SRST
Cisco Unified SRST can send and receive voice-mail messages from Cisco Unity and other voice-mail
systems during Cisco Unified CallManager fallback. When the WAN is down, a voice-mail system with
BRI or PRI access to the Cisco Unified SRST system uses ISDN signaling (see Figure 8). Systems with
Foreign Exchange Office (FXO) or Foreign Exchange Station (FXS) access connect to a PSTN and use
in-band dual tone multifrequency (DTMF) signaling (see Figure 9).