Patent ID: 7295547

Claim:
An audio gateway comprising a public switched telephone network terminating portion, an audio data processing portion, a header processing portion, a packet network line terminating portion and a gateway control processor, wherein said public switched telephone network line terminating portion comprises: means for terminating a public switched telephone network data and outputting audio data to said audio data processing portion; and means for processing the audio data outputted from said audio data processing portion according to a protocol of said public switched telephone network to obtain a public switched telephone network data and outputting the public switched telephone network data, said audio data processing portion comprises: means for converting the audio data outputted from said public switched telephone network line terminating portion into a packet and outputting an RTP packet having a header of a real-time transfer protocol for transferring an audio stream and a session number attached thereto to said header processing portion; and means for converting the RTP packet outputted from said header processing portion and having the header and the session number into audio data and outputting the audio data to said public switched telephone network line terminating portion, said header processing portion comprises: means for checking the session information of the RTP packet outputted from said audio data processing portion and having the session number, removing the session information and outputting an IP packet having a UDP/IP header information to said packet network line terminating portion; means for checking the UDP/IP header of the IP packet outputted from said packet network line terminating portion, removing the UDP/IP header of the IP packet when the IP packet is an RTP packet audio packet, attaching the session number to the IP packet to obtain an RTP packet with the session number to said audio data processing portion; and means for transferring a control data of the IP packet outputted from said packet network line terminating portion and to be processed by said gateway control processor to said gateway control processor, said packet network line terminating portion comprises: means for processing the IP packet from said header processing portion according to the protocol of the packet network and outputting a packet data to said packet network; and means for terminating said packet network, processing an input packet data according to the protocol of said packet network and outputting the IP packet to said header processing portion, said gateway control processor comprises: means for transferring a session information necessary in the header processing of the audio packet in said header processing portion to said header processing portion.