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Tech Stuff - Telephony

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

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 in tech speak) 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.
Jacks Common jacks - er, excuse, me, modular connectors.
Wiring Analog and digital wiring.
T1 wiring T1 wiring over DB25.


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Tech Stuff

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