Patent ID: 8600818

Claim:
A method for carrying a Point of Sale (POS) data service over an Internet Protocol (IP) network, the method comprising: receiving, by a home gateway, a number dialed by a user at a POS; when determining that the number dialed at the POS is a POS access code according to configuration information, setting up a call link with a softswitch through Session Initiation Protocol (SIP) signaling interactions and performing Session Description Protocol (SDP) negotiation with the softswitch to negotiate an operation of switching to a POS data service mode; switching a Digital Signal Processor (DSP) inside the home gateway from a normal voice mode to the POS data service mode according to receiving an instruction sent from the softswitch and after successful SDP negotiation between the home gateway and the softswitch; and performing POS negotiation with a Network Access Server (NAS) connected to a banking center and transferring data services exchanged between the POS and the banking center after successful negotiation.