Patent ID: 9270932
Filing Date: 2016-02-23
CPC Classification: H04L,H04N

Claim Text:
1. A method performed by data processing apparatus, the method comprising: initiating, by a first endpoint and through a call server, an audio call with a second endpoint; after the audio call is established, transmitting, by the first endpoint and independent of the call server, first information specifying a video communication capability of the first endpoint that the call server did not setup in the established audio call, wherein said first information specifying a video communication capability of the first endpoint is transmitted over a real-time control protocol (RTCP) channel of the audio call; receiving, by the first endpoint, second information specifying that the second endpoint has the video communication capability; and establishing, by the first endpoint and based on the first information and second information, video communication between the first endpoint and the second endpoint independent of the call server.