Cisco SPA2102-SF Administration Guide - Page 99

Configuring the PSTN (FXO) Gateway on the SPA3102 Other Options 6 • Line 1 can have the call forwarded to the PSTN Line after a few seconds using the Call-Forward-On-No-Answer feature with gw0 as the forward destination. Similarly, Line 1 can apply Call-Forward-All, Call-Forward-OnBusy, and Call-Forward-Selective feature, and direct the caller to the PSTNGateway. • Only PIN authentication is allowed when a VoIP caller is forwarded to the PSTN-gateway from Line 1. If HTTP Authentication is used, the caller is not authenticated. • When using the Forward-To-GW0 feature, you can forward the caller to a specific PSTN number, using the syntax @gw0 in the forward destination. When using this with Call-Forward-Selective, you can develop some interesting applications. For example, you can forward all callers with 408 area code to 14081234567, or all callers with 800 area code to 18005558355 (This is the number for Tell Me). When this syntax is used, authentication is not used and the target PSTN number is automatically dialed by the ATA device after the caller is forwarded to gw0. Other Options This section describes other options provided by the SPA3102 and the SPA8800: • "PSTN Call to Ring Line 1 (SPA3102)" section on page 99 • "Symmetric RTP (SPA3102 and SPA8800)" section on page 99 • "Call Progress Tones (SPA3102 and SPA8800)" section on page 100 PSTN Call to Ring Line 1 (SPA3102) On the SPA3102, this feature allows a PSTN caller to ring Line 1. When the PSTN line rings, the PSTN Line makes a local VoIP call to Line 1. If Line 1 is busy, it stops. After a given number of rings, the VoIP gateway picks up the call. Symmetric RTP (SPA3102 and SPA8800) The Symmetric RTP parameter is used to send audio RTP to the source IP and port of the inbound RTP packets. This facilitates NAT traversal. See "SIP Parameters section," on page 127. Cisco Small Business ATA Administration Guide 99