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Configuring the PSTN (FXO) Gateway on the SPA3102
Configuring VoIP Failover to PSTN
ATA Administration Guide 102
6
The following table lists some examples.
You can set up multiple PSTN gateways at different locations and configure Line 1
to use a different gateway when dialing specific numbers.
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
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 is done so 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.
Example Description
<9,:>xx.<:@gw1
Dial 9 to start outside dial tone, followed by one or
more digits, and route the call to Gateway 1.
[93]11<:@gw0>
Route 911 and 311 calls to the local PSTN gateway
<8,:1408>xxxxxxx<:@pstn.
cisco.com:5061;usr=joe;
pwd=joe_pwd;nat>
Dial 8 to start outside dial tone, prepend 1408
followed by seven digits, and route the call to
pstn.cisco.com:5061, with user-id = joe, and pwd =
bell_pwd, and enable NAT mapping
<8,:1408>xxxxxxx<:@gw2:5061;
usr=”Alex Bell”;pwd=
”anything”;nat=no>
Dial 8 to start outside dial tone, prepend 1408
followed by seven digits, and route the call to
Gateway 2, but use the given port, user-id, and
password, and no pstn.cisco.com:5061, and with
user-id = “Alex Bell” and pwd = bell_pwd, and
disable NAT mapping