VIDEO CALLS FOR EXTERNAL NETWORKS

摘要

A method for setting up a video communication session via an Internet Protocol (IP) network between a first correspondent and a second correspondent, the method having the steps of: the first correspondent placing a call through a public switched telephone network (PSTN) to the second correspondent to establish a PSTN communication session; the first correspondent sending a compatibility request via in-band signals to determine compatibility with the first correspondent for video communication; prompting the second correspondent to accept or decline an invitation for the video communication session; exchanging setup information via the PSTN for setting up the video communication session when the second correspondent accepts the invitation, the setup information comprising attributes of each of the correspondents; and setting up the video communication session via the IP network and terminating the PSTN communication session.