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Networking Guide for Cisco Unity Release 5.x (With Microsoft Exchange)
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Chapter 5 AMIS Networking
AMIS Concepts and Definitions
You can enable ISM for AMIS, Bridge, and VPIM subscribers (collectively referred to as external
subscribers), so that Cisco Unity will include them when comparing calling numbers to extensions. Note
the following:
• After enabling ISM for external subscribers, Cisco Unity must be restarted.
• If multiple Cisco Unity servers are networked via Digital Networking, ISM functionality can be
made available only on the Cisco Unity servers that are in the same dialing domain as the bridgehead
server.
• You must enable ISM for external subscribers for each Cisco Unity server on which the functionality
is desired.
• If a single Cisco Unity server is in use, the Cisco Unity server must be a member of a dialing domain
for this functionality to be used.
Note the difference between leaving a messaging and sending a message. When a person on the remote
voice messaging system with a corresponding external subscriber account records and sends a message
to a Cisco Unity subscriber (as opposed to calling and leaving a message), Cisco Unity identifies the
message as being from the corresponding external subscriber.
The phone system provides the calling number to Cisco Unity. The number of digits included in the
calling number is configurable in most phone systems. For Cisco Unity to find a matching subscriber
extension, the phone system must be configured to provide the applicable number of digits in the calling
number. You may also need to add alternate extensions to the subscriber accounts to match the calling
number. Additionally, there may be other phone system-specific issues that prevent Cisco Unity from
matching the calling number to a subscriber extension. Refer to your phone system documentation and
the applicable Cisco Unity integration guide for details about the call information provided by the phone
system.
Live Reply to AMIS SubscribersLive reply allows subscribers who listen to their messages by phone to respond to messages from other
subscribers by calling them. When live reply is enabled, subscribers who are listening to messages by
phone can reply to a subscriber message by choosing the “call the subscriber” option to have Cisco Unity
call the subscriber directly. Note that subscriber access to the live reply feature depends on their class of
service settings. (Live reply is enabled on the Subscribers > Class of Service > Messages page in the
Cisco Unity Administrator.)
Subscribers can live reply to messages from subscribers on other voice messaging systems who have
corresponding AMIS subscriber accounts in Cisco Unity. In order for the live reply call to be
successfully transferred, a call transfer number must be configured for the AMIS subscribers.
Note that a live reply to an AMIS subscriber is always done via a release to phone system transfer, even
when both the Cisco Unity subscriber who is replying to a message and the AMIS subscriber have
accounts on the same Cisco Unity server. On a release to switch transfer, Cisco Unity dials the call
transfer number that is configured for the AMIS subscriber and hangs up, leaving the phone system to
handle the call. Note the following limitations with release to switch transfers:
• The AMIS subscriber call screening, call holding, and announce features are ignored.
• The call transfer setting “No (Send Directly to Subscriber's Greeting)” is ignored. Cisco Unity dials
the AMIS subscriber extension and hangs up. If the subscriber extension is a valid extension on the
phone system that Cisco Unity is integrated with, then the subscriber phone rings. If the subscriber
extension is not a valid phone extension, what happens to the call after that depends on the phone
system and how it is configured. If you do not configure the phone system to handle calls to the
subscriber extensions, the caller may be disconnected.