Specifications

Integrating Voice Mail with Cisco Unified SRST
Information About Integrating Voice Mail with Cisco Unified SRST
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Cisco Unified Survivable Remote Site Telephony Version 4.0 System Administrator Guide
Figure 8 Cisco Unified CallManager Fallback with BRI or PRI
Figure 9 Cisco Unified CallManager Fallback with PSTN
Both configurations allow phone message buttons to remain active and calls to busy or unanswered
numbers to be forwarded to the dialed numbers’ mailboxes.
Calls that reach a busy signal, calls that are unanswered, and calls made by pressing the message button
are forwarded to the voice-mail system. To make this happen, you must configure access from the dial
peers to the voice-mail system and establish routing to the voice-mail system for busy and unanswered
calls and for message buttons.
If the voice-mail system is accessed over FXO or FXS, you must configure instructions (DTMF patterns)
for the voice-mail system so that it can access the correct voice-mail system mailbox. If your voice-mail
system is accessed over BRI or PRI, no instructions are necessary because the voice-mail system can
log in to the calling phone’s mailbox directly.
IP
IP
IP
146615
Cisco Unified CallManager
Voice-mail server
Cisco Unified CallManager
gateway
BRI/PRI
Cisco Unified
SRST gateway
WAN
WAN failure
IP
IP
IP
155102
Cisco Unified CallManager
Voice-mail server
Cisco Unified CallManager gateway
FXS
PSTN
FXO
WAN
WAN failure