I use asterisk 13.8 with PJSIP. I have SIP trunk beetwen my provider.
My issuse is my provider said me “you have to use out of band dtmf method” also I set the dtmf_mode=rfc4733 and he said me "this mode is not seem out of band, it is inband dtmf method please chek your PBX."
How can I check inband or out of band
Thanks for your replay