Patent ID: 8817775
Filing Date: 2014-08-26
Classification: H04L,H04M

Abstract:
1. An access gateway comprising: an IAD interface for receiving IP packets comprised of control packets and voice packets both sent from an integrated access device (IAD) together, to perform IP telephone service functions for each subscriber selectively in the access gateway, instead of performing IP telephone service functions for subscribers in the integrated access device (IAD); a control signal converter receiving, as input, said control packets from said IAD interface and converting the control packets to control information; a voice signal converter receiving, as input, said voice packets from said IAD interface and converting the voice packets to voice information; and an allocating circuit, connected to both soft switch (SS) at the IP network side and local exchange (LE) at the PSTN side, allocating said IP packets to either the soft switch (SS) or the local exchange (LE) upon receiving both said converted control information and said converted voice information applied from said control signal converter and voice signa converter, respectively, switching a current speech path, when a notification of trouble from the soft switch (SS) is received, to a PSTN speech path automatically or switching a current speech path, when a notification of trouble from the local exchange (LE) is received, to an IP speech path automatically, wherein, the access gateway is operative to perform protocol conversion between a first protocol defining transfer control of said IP packets and second protocol defining transfer control from said allocating circuit to said soft switch (SS), protocol conversion between said first protocol and a third protocol defining transfer control from said allocating circuit to said local exchange (LE), address conversion between the IP addresses of the IP packets transferred at said integrated access device (IAD) side and the IP addresses of the IP packets transferred at the soft switch (SS) side, and number-address conversion between the IP addresses of said IP packets transferred at said integrated access device (IAD) side and telephone numbers of TDM signals transferred at the local exchange (LE) side.