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SIP, RFC4733, RFC2833, and You
in The VoIP Weblog, on December 5, 2007
Chances are, if you've used a regular landline phone, you've made a call into a system where you have to press keys on your numeric keypad in order to reach your intended party (e.g. dialing an extension, trying to get your account balance at your bank). Touch tones, or dual-tone multifre...