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Fax and Modem Connectivity
The Cisco VG248 supports legacy fax machines and modems. When using fax machines, the Cisco VG248 uses the
Ciscofax-relay technology totransferfaxes acrossthenetwork withhighreliability usinglessbandwidth thanavoice
call. Any modems can be connected to the Cisco VG248.
Voice Mail Connectivity
The Cisco VG248 generates call information in an SMDI format for all calls ringing on any of the 48 analog lines
connected to it. It will also pass on SMDI from other Cisco VG248s, or from a legacy PBX to the voice mail system.
Any commands for message-waiting indicators will be sent to the Cisco CallManager and to any other attached
SMDI hosts.
This mechanism allows for many new configurations when using SMDI-based voice mail systems, including:
• A single voice mail system to be shared between Cisco CallManager and a legacy PBX (see Figure 3)
• Voice mail and Cisco VG248 to function remotely in a centralized call-processing model
• A single voice mail system to be used by multiple clusters, by using one Cisco VG248 per cluster
• Multiple voice mail systems to be used by a single cluster, because SMDI is being generated by Cisco VG248
rather than Cisco CallManager
• Reliability for SMDI links using Cisco CallManager failover
• Scalability via linking Cisco VG248s (see Figure 4)
Figure 3
Integration of Legacy Voice Mail and Legacy PBX Using SMDI
V
IP IPIP
Legacy PBX
SMDI
Gateway
Analog
Cisco
VG248
Legacy
Voice Mail
SMDI
Analog
CallManager
Cluster