Information Technology Reference
In-Depth Information
Next, you must configure call forwarding to voicemail using the call-forward command:
call-manager-fallback
call-forward busy 955512345678
call-forward noan 955512345678 timeout 10
The call-forward busy directory-number command is used to specify the number to which calls will be forwarded if phones are
busy. In this case, calls are forwarded to voicemail if phones are busy. (The number matches that configured using the voicemail
command.)
The call-forward noan directory-number timeout seconds command similarly configures the number to which calls will be
forwarded if there is no answer. (The call is forwarded after the configured timeout.) In this example, calls are forwarded to voicemail
if there is no answer. (The configured number again matches that specified using the voicemail command.)
If there is ISDN connectivity to the PSTN and RDNIS/ANI is provided in ISDN Setup, the configuration given so far might be
enough for forwarded calls to be correctly routed to the correct mailbox on the voicemail system. (The voicemail system uses RDNIS
to identify the correct mailbox.) However, depending on the precise configuration, it might also be necessary to choose Redirecting
Number IE Delivery - Outgoing on the central site CUCM gateway configuration page ( Device , Gateway ) to ensure that RDNIS/
ANI is delivered to the voicemail system along with the call. If RDNIS/ANI is not delivered to the voicemail system, it won't know
which mailbox to deliver the call to, and the caller will hear the voicemail system's opening greeting instead of the appropriate
mailbox greeting.
If PSTN connectivity is analog/T1 CAS, DTMF tones are used to route calls to the appropriate mailboxes and additional configuration
is necessary (see the following example):
call-manager-fallback
voicemail 955512345678
!
vm-integration
pattern direct * CGN
pattern ext-to-ext busy # FDN #2
pattern ext-to-ext no-answer # FDN #2
pattern trunk-to-ext busy # FDN #2
pattern trunk-to-ext no-answer # FDN #2
 
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