Configuring Voip Failover To Pstn; Sharing One Voip Account Between The Fxs And Pstn Lines; Other Options; Pstn Call To Ring Line - Linksys SPA1001 Administrator User Manual

Chapter 4 Configuring the PSTN Gateway (FXO)

Configuring VoIP Failover to PSTN

When power is disconnected from the SPA3102, the FXS port is connected to the FXO port. In this case,
the telephone attached to the FXS port is electrically connected to the PSTN service via the FXO port.
When power is applied to the SPA3102, the FXS port is disconnected from the FXO port. However, if
the PSTN line is in use when the power is applied to the SPA3102, the relay is not flipped until the PSTN
line is released. This is done so that the SPA3102 does not interrupt any call in progress on the PSTN
line.
When Line 1 VoIP service is down (because of registration failure or loss of network link), SPA3102
can be configured to automatically route all outbound calls to the internal gateway using the parameters
listed in
Table 1-32 Automatically Routing Outbound Calls to Internal Gateway
Parameter
Auto PSTN Fallback

Sharing One VoIP Account Between the FXS and PSTN Lines

The FXS (Line 1) and FXO (PSTN Line) can share a single VoIP account if they use different SIP ports.
If the service provider allows multiple registration contacts and simultaneous ringing, both lines can
register periodically with the service provider. In this case, both lines receive inbound calls to this VoIP
account. The PSTN Line should be configured with a sufficiently long answer delay before the call is
automatically answered to allow for the function of the PSTN gateway.
If the service provider does not allow more than one register contact, the PSTN Line should not register.
In this case, only Line 1 rings on the inbound call to this VoIP account because it is the only line
registered with the service provider.
Line 1 can have the call forwarded to the PSTN Line after a few seconds using the
Call-Forward-On-No-Answer feature with gw0 as the forward destination. Similarly, Line 1 can apply
Call-Forward-All, Call-Forward-On-Busy, and Call-Forward-Selective feature, and direct the caller to
the PSTN-Gateway.
Only PIN authentication is allowed when a VoIP caller is forwarded to the PSTN-gateway from Line 1.
If HTTP Authentication is used, the caller is not authenticated.
Another option when using the Forward-To-GW0 feature is to forward the caller to a specific PSTN
number, using the syntax <PSTN-number>@gw0 in the forward destination. When using this with
Call-Forward-Selective, you can develop some interesting applications. For example, you can forward
all callers with 408 area code to 14081234567, or all callers with 800 area code to 18005558355 (This
is the number for Tell Me). When this syntax is used, authentication is not used and the target PSTN
number is automatically dialed by the SPA3102 after the caller is forwarded to gw0.

Other Options

This section describes other options provided by the SPA3102. It includes the following topics:
•
Document Version 3.1
Table 1-32.
Group
Line 1
PSTN Call to Ring Line 1, page 4-8
Description
If enabled, SPA3102 automatically routes
outbound calls to Gateway 0 when registration
fails or network link is down.
Configuring VoIP Failover to PSTN
Range
Bool
Linksys ATA Administrator Guide
4-7