Cisco SPA2102-SF Administration Guide - Page 101

Configuring the PSTN (FXO) Gateway on the SPA3102 Call Scenarios 6 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 the call rings for a delay equal 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, the caller is prompted 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 ATA device 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 Line1 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 (SPA3102)" section on page 101 • "Using HTTP Digest Authentication (SPA3102)" section on page 102 • "Without Authentication (SPA3102 and SPA8800)" section on page 103 Using PIN Authentication (SPA3102) 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 ATA device then prompts the VoIP caller for a PIN. When a valid PIN is entered, the ATA plays the Outside Dial Tone and prompts the caller to dial the PSTN number. Cisco Small Business ATA Administration Guide 101