Cisco SPA2102-SF Administration Guide - Page 104

Configuring the PSTN (FXO) Gateway on the SPA3102 Call Scenarios 6 NOTE If the PSTN Line is busy at the moment of the forward, it does not answer the VoIP call. The call forward rule is ignored and Line 1 continues to ring. Forward-All to the PSTN gateway In this scenario, Line 1 is configured with Cfwd All Dest parameter to the PSTN gateway.This scenario is the same the previous case, except the FXO picks up the Line 1 call immediately. If the PSTN Line is busy at the moment of the call, the PSTN Line does not pick up the call, the call forward rule is ignored, and Line 1 continues to ring. Forward to a Particular PSTN Number In this scenario, the forward destination is set to @gw0>. This is the same as in the previous examples, except that the ATA device automatically dials the given target number on the PSTN line right after it answers the VoIP call leg. This is a special case of one-stage dialing where the target number is specified in the configuration. The caller is not authenticated in this case regardless of the authentication method. However, the caller is still limited by the VoIP Caller ID Pattern parameter Forward-On-Busy to PSTN Gateway or Number This scenario is similar to the previous cases of call forwarding to gw0, but this applies when Line 1 is active. Cisco Small Business ATA Administration Guide 104