Linksys ATA Administration Guide
78
How PSTN-To-VoIP Calls Work
Configuring the PSTN (FXO) Gateway
VoIP Outbound Call Routing
Calls made from Line 1 are routed through the configured Line 1 service provider, by default.
You can override this behavior by IP dialing, through which the calls can be routed to any IP
address entered by the user. The Linksys ATA device allows flexible call routing with four sets of
gateway parameters and configurable dial plans. The following table lists VoIP outbound call
routing parameters.
Long Silence Duration:
PSTN
Line
The minimum duration of continuous silence before the
Linksys ATA device disconnects the call, if the
Detect (PSTN)
Long Silence
parameter is enabled.
10-255
The default is
30(s)
.
Disconnect Tone:
PSTN
Line
Tone Script of the disconnect tone to detect. The Linksys
ATA device supports two frequency components. If the
tone has only one frequency, use the same value for both
frequencies.
Each cadence segment must have the same frequency.
The level value is the threshold to detect each tone.
The total duration is the minimum duration of the tone to
be recognized as the disconnect tone
ToneScript
The default is
480@-
30,620@-
30;4(.25/.25/
1+2)”
Detect Polarity Reversal:
PSTN
Line
If yes, the Linksys ATA device interprets polarity reversal as
a disconnect signal.
On an inbound PSTN call, Linksys ATA device disconnects
on the first polarity reversal. On an outbound PSTN call,
Linksys ATA device disconnects on the second polarity
reversal (because the first polarity reversal indicates the
outbound call is connected).
Yes or No
The default is
Yes
.
Detect Disconnect Tone:
PSTN
Line
If yes, the Linksys ATA device interprets the disconnect
tone as specified in the
Disconnect Tone
parameter as the
disconnect signal.
Yes or No
The default is
Yes
.
Silence Threshold:
PSTN
Line
This is the signal energy threshold. Below this threshold is
considered silence.
very low, low,
medium,
high, very
high
The default is
Medium
.
Parameter
Web
Page
Description
Values
Gateway 1
Line 1
Fully qualified domain name (or IP address) of a
gateway. If the port number is not specified, 5060 is
assumed.
Domain name or IP
address.
The default is blank.
GW1 Nat
Mapping Enable
Line 1
Whether to enable NAT mapping when using
Gateway 1.
Yes or No
The default is
no
.
GW1 User ID
Line 1
The authentication user name when using Gateway
1.
31-character string
The default is blank.
GW2 Password
Line 1
The authentication password when using Gateway 1. 31-character string.
The default is blank.