How to send DTMF A,B,C,D via Huawei E1552 with Asterisk 13 logging?

Question

Asterisk

Good afternoon. Asterisk 13.18.2 + chan_dongle + Huawei E1552. The essence of the task - a call to one modem - redirection through another modem to another number - logging DTMF exchange between numbers. The problem is the following - Sending DTMF A (as well as B, C, D) not supported by dongle. Tell Asterisk to generate inband. + Terrible distortion of the recipient. It seems like everything is simple (E1552 cannot generate them), but with dtmfmode=inband the same thing happens. Even if the tones are just played as audio into a microphone. Through experiments, I came to the conclusion that there are no DTMF ABCD distortions for the recipient only with dtmfmode=info, but no logging occurs. I played enough with the dongle.conf and relaxdtmf=yes/no parameters - there is no result.