How do you divide DTMF transmissions, such as in-band or out-of-band? Can RFC2833 be considered in-band?
specifically refers to sending the DTMF digit frequencies along the same voice path as the actual speech in a conversation. This works well for an uncompressed channel using G.711, but does not work reliably when using a compressed channel such as G.729.
RFC2833 DTMF uses an out-of-band approach. The idea here is that special Real-Time Transport Protocol (RTP) even...
By submitting your email address, you agree to receive emails regarding relevant topic offers from TechTarget and its partners. You can withdraw your consent at any time. Contact TechTarget at 275 Grove Street, Newton, MA.
messages are sent instead of the raw tones. For example, a message is sent indicating a "DTMF digit 7" versus sending the two frequencies that make up a DTMF 7. This approach is more reliable.