where the first image is a high resolution live image and the second image may be transmitted either as a high resolution live or still frame image two video streams representing the first and second images are transmitted together to the remote site within a single carrier channel the second image is transmitted as a still image whenever the second image is static to conserve bandwidth application_number US 10575202 A description fig1 shows a videoconference unit 120 located at a local site 100 the videoconference unit 120 captures live video images 105 and audio of users at a local site 100 the videoconference unit 120 then transmits the live video images 105 and the audio to a communications interface 140 through a carrier channel 130 the communications interface 140 transmits the signals to a remote site 160 by way of a communications path 150 examples of the communications path 150 include for example isdn internet etc the users of the videoconference unit 120 at the local site 100 can thus communicate both visually and audibly with users of a similar videoconference system at the remote site 160 the users at the remote site 160 will see and hear the video and sound generated by the users of the videoconference unit 120 at local site 100 because the videoconference unit 120 operates bi directionally users of a similar videoconference unit at the remote site 160 can likewise transmit video and sound to the users at the local site 100 in this way meetings between parties who are separated over large distances can take place in real time fig1 also shows an exemplary videoconference accessory module.