Hello!
Thanks for the software!
How to set DTMF inband mode only? What 's the string parameter, .ini file to make or edit?
How to set RFC2833 only or SIP-Info only?
Because some operators can not transmit or receive some formats of DTMF, and You know about transits.

Author wrote: There is an application called Phoner , with that PhonerLite shares common code and the file "sipper.dll". All VoIP specific configurations are the same and can be exchanged between Phoner and PhonerLite without any transformations.
I use both programs and know about modify or combine sets of configuration in .ini files.
Some programs and hardwares lets to set 1 only or 2 or Auto DTMF mode. Often if You call to IVR of some operator (not all) or to IVR of client of another operator, this IVR can't understand DTMF. Because You set RFC2833 (AVT) or SIP-Info or both (both is bad idea - possible numeral doubling) or Auto (If Your operator understand RFC2833 or SIP-Info - the inband will not support and will use only RFC2833 or SIP-Info for all operators), but  in some situations remote IVR understands the inband DTMF mode only, especially if there are some transit operator(s) used, but some operators support Inband DTMF mode only for incoming calls.
I don't see "SendOptionalInbandDTMF" in GUI's of both programs or in any ini files. I must to make this parameter in some .ini file? In what section's name? Set SendOptionalInbandDTMF=1 for Inband mode only, and it's enough?

If the first (not final) link's remote party operator tells about supporting RFC2833 but it's not final operator in current call's links, what's to do?
Need sometimes to set: use only Inband DTMF mode for this situations (I know about use G711 only for quality of Inband DTMF).