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Telephone links with extension numbers

by on February 11, 2010

tel:+358-555-1234567;postd=pp22

The above URL instructs the local entity to place a voice call to
+358-555-1234567, then wait for an implementation-dependent time (for
example, two seconds) and emit two DTMF dialing tones “2” on the line
(for example, to choose a particular extension number, or to invoke a
particular service).
http://www.ietf.org/rfc/rfc2806.txt

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