Nortel Networks Computer Accessories NN10029-111 Manuel D’Utilisation
Overview
23
Copyright © 2003, Nortel Networks
MCP SIP Application Module Basics
Nortel Networks Confidential
transmits the following information over a data link to a voicemail
server:
server:
•
the called number (terminating party's telephone number)
•
the calling number
•
the type of call forwarding (for example, due to a busy line, an
unanswered call)
unanswered call)
This feature also provides an interface to pure IP solutions that use a
SIP-enabled voicemail server. In this case, SIP messages provide the
context data for each call needed by the voicemail server to record a
voicemail message. Thus, a SIP-enabled voicemail server accepts
Invites for calls routed to voicemail and sends Notify messages for MWI
information. The software uses Real-Time Transport Protocol (RTP) to
carry the voice media.
SIP-enabled voicemail server. In this case, SIP messages provide the
context data for each call needed by the voicemail server to record a
voicemail message. Thus, a SIP-enabled voicemail server accepts
Invites for calls routed to voicemail and sends Notify messages for MWI
information. The software uses Real-Time Transport Protocol (RTP) to
carry the voice media.
There are two configurations through which the SIP Application Module
supports voicemail:
supports voicemail:
•
A pure IP, third-party, SIP-enabled voicemail server that uses RTP
to establish the voice path from the subscriber to the voicemail
server while SIP provides the setup and MWI information.
to establish the voice path from the subscriber to the voicemail
server while SIP provides the setup and MWI information.
•
A legacy voicemail server that uses a SIP/PSTN gateway to
establish the voice path from the subscriber to the PSTN-based
voicemail server. The Simplified Message Desk Interface (SMDI)
protocol provides the setup information. The platform uses any
voicemail server that supports the SMDI protocol. There are two
supported physical connections: a line-based gateway and a
PRI/T1-based gateway.
establish the voice path from the subscriber to the PSTN-based
voicemail server. The Simplified Message Desk Interface (SMDI)
protocol provides the setup information. The platform uses any
voicemail server that supports the SMDI protocol. There are two
supported physical connections: a line-based gateway and a
PRI/T1-based gateway.
Using either of the above configurations, there are three primary
scenarios that this feature considers:
scenarios that this feature considers:
•
MESSAGE DEPOSIT: An incoming call for a subscriber gets routed
to voicemail because the called subscriber is unavailable, busy, or
has all calls forwarded to voicemail.
to voicemail because the called subscriber is unavailable, busy, or
has all calls forwarded to voicemail.
•
MESSAGE NOTIFICATION: The voicemail server sends an MWI
status update to the SIP Application Module for a particular
subscriber. The SIP Application Module then sends a message to
the client(s) to update its MWI display.
status update to the SIP Application Module for a particular
subscriber. The SIP Application Module then sends a message to
the client(s) to update its MWI display.
Note: Clients do not store the MWI state. Only the Presence
Module stores the state. When a client registers with the proxy
Module stores the state. When a client registers with the proxy