Patent ID: 8493885

Claim:
An analog telephony adapter, comprising: a processor; and a computer-readable medium, the computer-readable medium storing a plurality of instructions which, when executed by the processor, cause the processor to perform operations, the operations comprising: receiving analog fax signals from a computing device coupled to the analog telephony adapter; transcoding the analog fax signals; generating a session initiation protocol invite message for the analog fax signals that are transcoded; submitting the session initiation protocol invite message to an application server, wherein the application server is for establishing a real time protocol channel with the analog telephony adapter responsive to the session initiation protocol invite message, wherein the application server is for submitting a session initiation protocol subscribe message to an intermediate node requesting that the intermediate node monitor the real time protocol channel for fax signals, wherein the intermediate node is for determining the analog fax signals that are transcoded are present in response to the intermediate node receiving the session initiation protocol subscribe message from the application server requesting the intermediate node monitor the real time protocol channel for fax signals, and wherein the application server is further for receiving from the intermediate node a session initiation protocol notify message indicating that the analog fax signals that are transcoded have been detected; and receiving from the application server a session initiation protocol re-invite message requesting fax over internet protocol signals over the real time protocol channel.