Television – Two-way video and voice communication – User positioning
Patent
1992-07-23
1994-12-06
Kuntz, Curtis
Television
Two-way video and voice communication
User positioning
348 16, 348 17, 379 94, H04N 714, H04M 1100
Patent
active
053715349
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.
REFERENCES:
patent: 5101427 (1992-03-01), Kotani et al.
patent: 5184345 (1993-02-01), Sahi
"The 5ESS Switching System" AT&T Technical Journal, vol. 64, No. 6, part 2, pp. 1305-1564, Jul./Aug., 1985.
"No. 4 ESS" Bell System Technical Journal (BSTJ) vol. 56, No. 7, pp. 1015-1320, Sep., 1977.
"Recommendations of the H-Series" International Telegraph and Telephone Consultative Committee (CCITT) Study Group XV--Report R 37, Geneva Mtg. 16-27 Jul. 1990.
ISDN Q.931 Fallback negotiation standards, pp. 73-77, Mar., 1992.
Dagdeviren Nuri R.
Mohammadi Khashayar
Papanicolaou Andreas C.
AT&T Corp.
Chan Jason
Kuntz Curtis
Slusky Ronald D.
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