Specifications

Integrating Voice Mail with Cisco Unified SRST
How to Integrate Voice Mail with Cisco Unified SRST
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Cisco Unified Survivable Remote Site Telephony Version 4.0 System Administrator Guide
Call Routing Instructions Using DTMF Digit Patterns
Cisco Unified SRST call-routing instructions are required so that forwarded calls can be sent to the
correct voice mailboxes. These instructions consist of DTMF digits configured in patterns that match the
dial sequences required by the voice-mail system to get to a particular voice-mail location. For example,
a voice-mail system may be designed so that callers must do the following to leave a message:
1. Dial the central voice-mail number (1101) and press #.
2. Dial an extension number (6000) and press #.
3. Dial 2 to select the menu option for leaving messages in the extension number’s mailbox.
For Cisco Unified SRST to forward a call to a busy or unanswered number to extension 6000’s mailbox,
it must be programmed to issue a sequence of 1101#6000#2. As shown in Figure 10, this is accomplished
through the voicemail and pattern commands.
Figure 10 How Voice-Mail Dial Sequence 1101#6000#2 Is Configured in Cisco Unified SRST
The # cgn #2, # cdn #2, and # fdn #2 portions of the pattern commands shown in Figure 10 are DTMF
digit patterns. These patterns are composed of tags and tokens. Tags are sets of characters representing
DTMF tones. Tokens consist of three command keywords (cgn, cdn, and fdn) that declare the state of
an incoming call transferred to voice mail.
A tag can be up to three character from the DTMF tone set (A to D, 0 to 9, # and *). Voice-mail systems
can use limited sets of DTMF tones. For example, Cisco Unity uses all DTMF tones but A to D. Tones
can be defined in multiple ways. For example, when the star (*) is placed in front of a token by itself, it
can mean “dial the following token number,” or, if it is at the end of a token, it can mark the end of a
token number. If the asterisk is between other tag characters, it can mean dial *. The use of tags depends
on how DTMF tones are defined by your voice-mail system.
Tokens tell Cisco Unified SRST what telephone number in the call forwarding chain to use in the pattern.
As shown in Figure 11, there are three kinds of tokens that correspond to three possible call states during
voice-mail forwarding.
call-manager-fallback
pattern ext-to-ext busy
# cgn #2
pattern ext-to-ext busy
# cdn #2
pattern ext-to-ext busy
# fdn #2
pattern ext-to-ext no-answer
# cgn #2
pattern ext-to-ext no-answer
# cdn #2
pattern ext-to-ext no-answer
# fdn #2
pattern trunk-to-ext busy
# cgn #2
pattern trunk-to-ext busy
# cdn #2
pattern trunk-to-ext busy
# fdn #2
pattern trunk-to-ext no-answer
# cgn #2
pattern trunk-to-ext no-answer
# cdn #2
pattern trunk-to-ext no-answer
# fdn #2
#6000#21101
call-manager-fallback
voicemail 1101
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