Linksys ATA Administration Guide
84
Call Scenarios
Configuring the PSTN (FXO) Gateway
NOTE:
HTTP Digest Authentication is one way to perform one-stage dialing of a VoIP-To-PSTN
call. The other way is with no authentication require. However, if the target number is not
specified in the Request-URI or the number matches the account user-id of the PSTN Line, the
call reverts to two-stage dialing.
Without Authentication
This scenario can also be implemented without authentication, using one-stage or two-stage
dialing, as in the HTTP Authentication case. The default VoIP caller dial plan is used in this
scenario. Authentication is performed when the method is none or when the source IP address
of the inbound INVITE matches one of the
VoIP Access List
patterns.
The following table lists the parameters used in VoIP to PSTN Call With and Without
Authentication.
Parameter
Web
Page
Description
Values
VoIP Answer Delay
PSTN Line
A
delay in seconds before auto-answering inbound
VoIP calls for the FXO account.
0-255.
The range is
The default is
3.
Outside Dial Tone
Regional
Alternative to the Dial Tone. It prompts the user to
enter an external phone number, as opposed to an
internal extension. It is triggered by a comma
encountered in the dial plan.
The default is
420@-
19;10(*/0/1)
.
VoIP Caller ID Pattern
PSTN Line
A comma-separated list of caller number templates
such that callers with numbers not matching any of
these templates are rejected for PSTN gateway
service regardless of the setting of the
authentication method. The comparison is applied
before the access list is applied. If this parameter is
blank (not specified), all callers are considered for
PSTN gateway service.
For example:
1408*,
1512???1234.
Note: ‘?’
matches any
single digit;
‘*’ matches
any number
of digits.
The default is
blank.
VoIP Access List
PSTN Line
A comma-separated list of IP address templates,
such that callers with a source IP address matching
any of the templates are accepted for PSTN
gateway service without further authentication.
For example:
192.168.*.*,
66.43.12.1??.
The default is
blank.