Tom Keating : VoIP & Gadgets Blog
Tom Keating
CTO
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World PSTN Call Progress Tones Database

Telephony developers working in VoIP, PBXs, VoIP gateways, phones, modems and other PSTN technologies that are developing products internationally have to know the varying international call progress tones that differ from country-to-country. Of course, figuring out the disconnect or other...
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