Nortel Networks NN10033-111 SIP-based Voicemail Server MCP network, Trunk-based voicemail servers

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Figure 3 SIP-based Voicemail Server

MCP network SIP

UNIStim

MGCP+

RTP RTP

For more information on how the SIP Application Module uses Media Gateway Control Protocol Plus (MGCP+) to control the RTP Media Portal, please refer to the MCP Media Portal Basics document.

For more information on how the IP Client Manager uses Unified Networks IP Stimulus (UNIStim) to control the i2004 Internet Telephone, please refer to the MCP IP Client Manager Basics document.

Trunk-based voicemail servers

Trunk-based voicemail servers cannot directly communicate with the MCP network. A SIP PRI Gateway is required for the MCP to interwork with a trunk-based voicemail server. The SIP PRI Gateway also provides a media path from the IP network to the voicemail server on the PSTN.

A terminal server, using a Simplified Message Desktop Interface (SMDI), sends data regarding the storage and retrieval of voicemail from the trunk-based voicemail server to the MCP network. The MCP network does not send data back to the voicemail server over the SMDI link. Figure 4 shows a network view of the MCP interconnection with a trunk-based third-party voicemail server.

NN10033-111 Standard MCP 1.1 FP1 (02.02) April 2003 Copyright © 2003, Nortel Networks