Method for feeding call progress tones into conference connectio

Details Method for feeding call progress tones into conference connectio Method for feeding call progress tones into conference connectio

1981-01-26

1983-07-12

Bookbinder, Marc E.

Multiplex communications

Wide area network

Packet switching

179 18BC, H04M 356

Patent

active

043934960

ABSTRACT:
In addition to the overall sum code words, call progress tone sum code words are formed which, in addition to the conference parts, respectively include a different PCM word corresponding to a call progress tone. In the formation of the respective partial sum code words to be transmitted, by subtraction from individual conference components, an overall sum code word or a call progress tone sum code word are selectively taken into consideration depending upon whether a call progress word is to be fed in or not or, respectively, depending upon what call progress tone is concerned.

REFERENCES:
patent: 4049921 (1977-09-01), Zwack
patent: 4109111 (1978-08-01), Cook
patent: 4190742 (1980-02-01), Southard

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