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Linksys SPA9000 Administrator Guide
Document Version 3.01
Chapter 1 Using the Linksys Voice System
The Linksys Voice System
Figure 1-1 The Linksys Voice System (LVS) with the SPA9000 and SPA400
The LVS 9000 system uses the power of VoIP to provide enterprise-quality telephony features to small
office/home office (SOHO) and small businesses. The LVS is based on open standards, such as SIP,. This
allows interoperation with other standards-based products and simplifies configuration and use. The
SPA9000, with a base license, supports up to four IP phones and up to 16 phones with an upgraded
license.
With the optional SPA400, the SPA9000 can also manage calls to and from the PSTN. The SPA9000 also
includes an Analog Telephone Adapter (ATA), with two FXS ports for connecting analog telephones, fax
devices, or an external music source for the music on-hold service included with the SPA9000.
The SPA9000 supports four independent line interfaces with numbers assigned by one to four different
ITSPs, with each line supporting up to 16 extensions. If the service provider supplies a group of
sequential direct inward dial (DID) phone numbers (such as 408-777-1000 through 777-1015) the
SPA9000 can support all the assigned numbers on a single line interface.
For information about LVS architecture, refer to the “SPA9000 Architecture” section on page 1-11.
SPA400 SIP-PSTN Gateway and Voicemail
The SPA400 is optionally used with the SPA9000 to provide a SIP-PSTN gateway, providing voice
connectivity between the PSTN and local client stations connected to the SPA9000. It also provides a
local voicemail server.
Note The SPA400 provides four FXO ports and occupies one line interface on the SPA9000.
A total of four SPA400 devices can be configured per SPA9000, using up to 16 analog phone lines and,
with the SPA9000, automatically routing calls to and from your existing PSTN telephone service.
SPA400
SIP-PSTN
gateway
SPA901, 921, 922, 941, 942, 962
Internet
ITSP
Up to 4 FXO lines
Local voicemail
Fax/Analog
Phones
SPA9000
IP PBX
PSTN
ISP
FXS1
FXS2
Switch