<div>Hi all,<br>Has anyone tried conveying signaling tones (DTMF) through speex? If so, can i get an idea of the lowest bit-rate at which I can do so with 'tolerable distortion'. G.728 does so and G.729E (11.8 Kbps mode) is 'claimed' to do so but even if true,
G.729 (rather G.729I - 11.8/8/6.4 kbps) does not allow me to go below 6.4 kbps if needed. Basically I am looking for a single codec which would allow me to play with multiple (low) bit-rates within voice and switch to a higher bit-rate upon detecting a signaling tone instead of using RFC 2833/out-of-band signaling methods. I hope speex is the solution am looking for!
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<div>Regards,<br>Mainak</div>
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<div>PS: In any case I will have to test it out myself but a positive answer to this query would definelty brighten up the road ahead :-)<br> </div>