ISDN-based system for making a video call
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United States of America Patent
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Dec 6, 1994
Grant Date -
N/A
app pub date -
Jul 23, 1992
filing date -
Jul 23, 1992
priority date (Note) -
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Abstract
A single medium (audio) voice grade call initiated by an ISDN video phone and directed to another ISDN video phone is converted into a multimedia (audio and video) ISDN call by a) maintaining the connection for the voice grade call while the ISDN audio and video connection is being established over a bearer channel of the ISDN subscriber loop different from the bearer channel being used by the voice grade connection, b) switching the audio signals from the voice grade call to the ISDN audio and video connection, once the ISDN audio and video connection is established, and c) tearing down the initial voice grade call.
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