Tech Info - Telephony Stuff

Collection of bits and pieces about telephony standards, values and other useful (!!?) stuff:

Section	Contents
Network Tones	Major Call Progress tones used in North American network (frequencies & power).
DTMF Tones	Frequencies of Standard DTMF tones
Ring Patterns	North America and Europe. Ring patterns (cadences) used in the switched network - so help me if I hear one more 'Ride of the Valkeries' on a cell phone....
VoIP	Simple performance (packet and data rate) comparison of various VoIP encoding standards
ISDN	ISDN Standards, packet formats, and IEs.

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Tech Info - Telephony Stuff

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