Voice calling method and edge device combined with virtual private network

The invention provides a voice calling method and an edge device combined with a virtual private network (VPN), and is characterized in that a voice calling interface is pre-established on the edge device connected with a voice terminal directly, and is bound with a VPN embodiment. The method comprises the following steps: after the edge device receives a voice calling message sent by the voice terminal which is directly connected with the edge device, a objective VPN embodiment corresponding to the called voice terminal is determined; according to the determined objective VPN embodiment, a VPN routing list is searched, and an outgoing interface corresponding to the objective VPN embodiment is determined; an IP address of the voice calling interface bound with the objective VPN embodiment is taken as an original IP address of the voice calling message; the voice calling message is encapsulated according to an MPLS VPN format; and after encapsulating, the voice calling message is sent from the determined outgo