Spa400 Sip-Pstn Gateway - Cisco Small Business Pro SPA9000 Administration Manual

Advanced Topics in SPA9000 Administration
Technology Background
SPA9000 Voice System Administration Guide
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SPA400 SIP-PSTN Gateway

When a local user on 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
UserA
The SPA400 then converts the SIP and RTP packets it receives from UserA and
the signals it receives from the PSTN switch.
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network initiates a call to a PSTN subscriber, the
SPA9000
UserD
UserB
Internet (WAN) Interface
SPA9000
SIP Proxy
PSTN
1 to 4 DID lines
SPA400
SIP-PSTN
Gateway
Switch
A
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