Tandem free operation over packet networks

Details Tandem free operation over packet networks Tandem free operation over packet networks

2011-01-25

2011-01-25

Moe, Aung S (Department: 2474)

Multiplex communications

Pathfinding or routing

Combined circuit switching and packet switching

C370S401000, C370S466000, C455S445000

Reexamination Certificate

active

07876745

ABSTRACT:
A packet-based network carries a stream of voice band data, such as PCM voice data, which can include tandem free operation (TFO) information. Voice data is usually subject to processing, such as compression, at an ingress entity. The ingress entity determines whether the stream of voice data contain tandem free operation (TFO) information and, if TFO information is present, sends the TFO information across the packet network without subjecting it to processing. This preserves the integrity of the TFO information. TFO information can be carried by an unprocessed channel having a bandwidth of less than 64 kbit/s. TFO information is reinserted at an egress entity of the packet network.

REFERENCES:
patent: 7136375 (2006-11-01), Koistinen
patent: 7257114 (2007-08-01), Koistinen
patent: 2003/0193934 (2003-10-01), Dropmann et al.
patent: 2004/0004957 (2004-01-01), Rabipour et al.
patent: 2004/0076271 (2004-04-01), Koistinen et al.

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