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Cisco Systems, Inc.

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Figure 4

Analog Voice Mail Scalability

Protocols Supported

• Skinny Client Control Protocol (SCCP)

• Real-Time Transport Protocol (RTP)

• Trivial File Transfer Protocol (TFTP)

• File Transfer Protocol (FTP) (for ﬁrmware upgrades)

• Hypertext Transfer Protocol (HTTP) server

(status information only)

• Simple Network Management Protocol (SNMP)

• Telnet

• Dynamic Host Conﬁguration Protocol (DHCP)

• Domain Name System (DNS)

• Cisco CallManager 3.1

• Cisco CallManager redundancy support

• Call survivability

• Music on hold

• Coder/decoder (codec) support, G.711 or G.729a

Cisco

CallManager

Cluster

Legacy

Voice Mail

Analog

SMDI

IP IPIP

Cisco

VG248

SMDI

passed

between

VG248s

1 2 3 4 5 6 7

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Cisco VG248 Scheda Tecnica Pagina 4