Configuring Voip Failover To Pstn; Sharing One Voip Account Between The Fxs And Pstn Lines (Spa3102)93 - Cisco SPA2102 Administration Manual

Configuring the PSTN (FXO) Gateway on the SPA3102

Configuring VoIP Failover to PSTN

Configuring VoIP Failover to PSTN
Sharing One VoIP Account Between the FXS and PSTN Lines
(SPA3102)
Cisco Small Business ATA Administration Guide
You can set up multiple PSTN gateways at different locations and configure Line 1
to use a different gateway when dialing specific numbers.
When power is disconnected from the ATA, 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 ATA device,
the FXS port is disconnected from the FXO port. However, if the PSTN line is in use
when the power is applied to the ATA device, the relay is not flipped until the
PSTN line is released. This feature ensures that the ATA device 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), the ATA device can be configured to automatically route all outbound
calls to the internal gateway using the parameter listed below.
For SPA3102, you can configure this setting on the Voice tab > Line page. For
SPA8800, you can configure this setting on the Voice tab > Phone page. For more
information, see “VoIP Fallback to PSTN section (SPA3102 and SPA8800),” on
page 175.
On the SPA3102, both the FXS (Line 1) and FXO (PSTN Line) can receive incoming
calls for a single VoIP account if they are different ports. Consider the following
points:
• 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.
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