Cisco Systems SPA9000 manual SPA400 SIP-PSTN Gateway, SPA400 as a SIP-PSTN Gateway

Models: SPA9000

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Advanced Topics in SPA9000 Administration

Technology Background

SPA400 SIP-PSTN Gateway

A

When a local user on the SPA9000 network initiates a call to a PSTN subscriber, the SPA400 acts as the SIP-PSTN gateway, which converts the SIP and RTP media packets into the appropriate signal for transmission to the PSTN switch. For example, if UserA calls UserD, the SIP request is routed by the SIP proxy in the SPA9000 to the SPA400.

Figure 3 SPA400 as a SIP-PSTN Gateway

PSTN

UserD

UserA

1 to 4 DID lines

SPA400

SIP-PSTN

UserBGateway

Switch

Internet (WAN) Interface

SPA9000

SIP Proxy

The SPA400 then converts the SIP and RTP packets it receives from UserA and the signals it receives from the PSTN switch.

SPA9000 Voice System Administration Guide

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Page 171
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Cisco Systems SPA9000 manual SPA400 SIP-PSTN Gateway, SPA400 as a SIP-PSTN Gateway