System information

Advanced Options for Voice Services
VoIP-to-PSTN and PSTN-to-VoIP Calling
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• pwd: Password used for authentication with the given gateway
• nat: Enable or disable NAT mapping when calling the gateway
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 ATA, the FXS port is connected to the LINE
port. In this case, the telephone attached to the FXS port is electrically connected
to the PSTN service via the LINE port. When power is applied to the ATA device,
the FXS port is disconnected from the LINE 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.
You can configure this setting on the Voice > Line 1 page.
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