Cisco SPA1001 Administration Guide - Page 81

Chapter 4 Configuring the PSTN Gateway (FXO) • 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 Call Scenarios 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 , 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 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 . The SPA3102 then prompts the VoIP caller for a PIN. When a valid PIN is entered, the SPA3102 plays the 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). Document Version 3.1 Linksys ATA Administrator Guide 4-9