Multiplex communications – Diagnostic testing – Fault detection
Reexamination Certificate
2011-08-02
2011-08-02
Ngo, Ricky (Department: 2464)
Multiplex communications
Diagnostic testing
Fault detection
C348S014080
Reexamination Certificate
active
07990879
ABSTRACT:
The present invention relates to instability problems in circuit switched conferencing, and provides a method for establishing a backup “voice only” telephony link in parallel with a H.320 conference link. The two links between the calling parties is handled as one logical call entity. Audio is muted on the backup voice telephony link when status of the H.320 link is okay. If communication problems are detected on the H.320 link, audio is muted over the H.320 link and switched to the backup voice telephony link instead.
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Ngo Ricky
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Tandberg Telecom AS
Yuen Kan
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