Method and system for entrance guard remote control by telephone, and entrance guard gateway

The invention discloses a method and a system for entrance guard remote control by telephone, and an entrance guard gateway, and relates to the field of entrance guard monitoring. The method comprises: an entrance guard gateway receiving entrance machine sent a rering signal when an indoor machine is unanswered, the calling number of the rering signal is an entrance machine number, and the called number of the rering signal is the indoor machine number; the entrance guard gateway inquires a bound resident contact phone number according to the entrance machine number and the indoor machine number in the rering signal; and the entrance guard gateway distributes a temporary number for the rering signal, and performs an outgoing call, the calling number of the outgoing call is the distributed temporary number, and the called number of the outgoing call is the resident contact phone number, so that after the outgoing call is answered, a resident can perform remote conversation with a visitor, and the resident can perform remote control on the entrance machine after confirming the identity of the visitor. The technical scheme solves the problem that a conventional building talk-back and entrance guard system can be used only in the internal net of a local community, and a resident can remotely control entrance guard through a phone.