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Linksys ATA
Administrator Guide
Document Version 3.1
Chapter 4
Configuring the PSTN Gateway (FXO)
Call Scenarios
•
PSTN to VoIP Call with and Without Ring-Thru, page 4-9
•
VoIP to PSTN Call with and Without Authentication, page 4-9
•
Call Forwarding to PSTN Gateway, page 4-10
•
User Dialing 9 to Access PSTN-Gateway for Local Calls, page 4-11
•
Using the PSTN-Gateway for 311 and 911 Calls, page 4-12
•
Auto-Fallback to the PSTN-Gateway, page 4-12
PSTN to VoIP Call with and Without Ring-Thru
The PSTN caller calls the PSTN line connected to the FXO port. Ring-Thru is disabled. After it rings
for a delay equals to the value in <PSTN Answer Delay>, the VoIP gateway answers the call and prompts
the PSTN caller to enter a PIN number (assuming PIN authentication is enabled). After a valid PIN is
entered, a regular dial plan is played to prompt the PSTN caller to dial the VoIP number. A dial plan is
selected according to the PIN number entered by the caller. If authentication is disabled, the default
PSTN dial plan is used. Note than the dial plan choice cannot be 0 for a PSTN caller.
Note
A <PSTN Access List> in terms of Caller ID (ANI) patterns can be configured into the SPA3102 to
automatically grant access to the PSTN caller without entering the PIN. In this case, the default PSTN
dial plan is also used.
The same scenario can be implemented using Ring-Thru. When the PSTN line rings, Line 1 rings also.
This feature is called
Ring-Thru
. If Line 1 is picked up before the VoIP gateway auto-answers, it is
connected to the PSTN call. Line 1 hears a call waiting tone if it is already connected to another call.
VoIP to PSTN Call with and Without Authentication
This section describes three scenarios with and without authentication and includes the following topics:
•
Using PIN Authentication, page 4-9
•
Using HTTP Digest Authentication, page 4-10
•
Without Authentication, page 4-10
Using PIN Authentication
This scenario assumes that the PSTN Line has a different VoIP account than the Line 1 account. The
VoIP caller calls the FXO number, which auto-answers after <VoIP Answer Delay>. The SPA3102 then
prompts the VoIP caller for a PIN. When a valid PIN is entered, the SPA3102 plays the <Outside Dial
Tone> and prompts the caller to dial the PSTN number.
The number dialed is processed by the dial plan corresponding to the VoIP caller. If the dial plan choice
is 0, no dial plan is needed and the user hears the PSTN dial tone right after the PIN is entered. If the
dial plan choice is not 0, the final number returned from the dial plan after the complete number is dialed
by the caller is dialed to the PSTN. The caller does not hear the PSTN dial tone (except for a little leakage
before the first digit of the final number is auto-dialed by the SPA3102).