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Design Guide for Cisco Unity Release 5.x
OL-14619-01
Chapter 6 Integrating Cisco Unity with the Phone System
Integrating with Cisco Unified Communications Manager Express (by Using SCCP or SIP)
When the Cisco Unified SRST router uses PRI or BRI connections, the caller ID for calls from a branch
office to Cisco
Unity may be the full number (exchange plus extension) provided by the PSTN and
therefore may not match the extension of the Cisco
Unity subscriber. In this case, you can let
Cisco
Unity recognize the caller ID by using alternate extensions or by using extension remapping. For
information on extension remapping, see the “Remapping Extension Numbers” section of the
“Managing System-Wide Settings” chapter in the applicable System Administration Guide for
Cisco
Unity Release 5.x, available at
http://www.cisco.com/en/US/products/sw/voicesw/ps2237/prod_maintenance_guides_list.html.)
When using Cisco Unified SRST, Redirected Dialed Number Information Service (RDNIS) must be
supported.
For information on setting up Cisco Unified SRST routers, see the “Integrating Voice Mail with Cisco
Unified SRST” section of the Cisco Unified SRST System Administrator Guide at
http://www.cisco.com/en/US/products/sw/voicesw/ps2169/products_installation_and_configuration_g
uides_list.html.
Impact of Non-Delivery of RDNIS on Voice Mail Calls Routed via AAR
RDNIS needs to be supported when using Automated Alternate Routing (AAR).
AAR can route calls over the PSTN when the WAN is oversubscribed. However, when calls are rerouted
over the PSTN, RDNIS can be affected. Incorrect RDNIS information can affect voice mail calls that are
rerouted over the PSTN by AAR when Cisco
Unity is remote from its messaging clients. If the RDNIS
information is not correct, the caller will not reach the mailbox of the dialed user but will instead receive
the automated attendant prompt, and the caller might be asked to reenter the extension number of the
party they want to reach. This behavior is primarily an issue when the telephone carrier is unable to
ensure RDNIS across the network. There are numerous reasons why the carrier might not be able to
ensure that RDNIS is properly sent. Check with your carrier to determine whether it provides guaranteed
RDNIS delivery end-to-end for your circuits. The alternative to using AAR for oversubscribed WANs is
simply to let callers hear reorder tone in an oversubscribed condition.
Call forward to internal greeting
When the Cisco Unified SRST router uses FXO/FXS connections to the
PSTN and a call is forwarded from a branch office to Cisco
Unity, the
internal greeting cannot play. Because the PSTN provides the calling
number of the FXO line, the caller is not identified as a subscriber.
Call transfers
Because an access code is needed to reach the PSTN, call transfers from
Cisco
Unity to a branch office will fail.
Identified subscriber messaging
When the Cisco Unified SRST router uses FXO/FXS connections to the
PSTN and a subscriber at a branch office leaves a message or forwards
a call, the subscriber is not identified. The caller appears as an
unidentified caller.
Message waiting indication
MWIs are not updated on branch office phones, so MWIs will not
correctly reflect when new messages arrive or when all messages have
been listened to. We recommend resynchronizing MWIs after the WAN
link is reestablished.
Message notification
Because an access code is needed to reach the PSTN, message
notifications from Cisco
Unity to a branch office will fail.
Routing rules
When the Cisco Unified SRST router uses FXO/FXS connections to the
PSTN and a call arrives from a branch office to Cisco
Unity (either a
direct or forwarded call), routing rules will fail.