Patent ID: 8625578
Filing Date: 2014-01-07
Classification: H04L,H04M

Abstract:
1. A method of placing a call, comprising: receiving a call request to a destination phone number from a caller phone at a first border element, wherein the caller phone is connected to the first border element using a time division multiplexing technology; forwarding the call request from the first border element to a call control element, wherein the first border element communicates with the call control element using a session initiation protocol, wherein the call control element only communicates in the session initiation protocol, wherein the call request is for being sent via the call control element to a second border element connected to a destination phone, wherein the second border element is selected from a plurality of second border elements, wherein the plurality of second border elements comprises a session initiation protocol to H.323 border element, a session initiation protocol to a media gateway control protocol border element, a session initiation protocol to a media gateway control border element, a session initiation protocol to a signaling system 7 protocol border element, a session initiation protocol to a central authentication service protocol border element and a session initiation protocol to an integrated services digital network protocol border element; establishing the call between the caller phone and the destination phone; receiving, by the first border element, a hangup message sent from the destination phone, wherein the receiving the hangup message sent from the destination phone comprises receiving a bye command sent from the second border element via the call control element; and disconnecting the caller phone from the first border element.