In yate log I could see:
2023-05-20_10:30:36.072021 <sip/1515732:NOTE> Failed to send tones '4' methods=rfc2833 [0x7f847c01fc40]
Returned false 'chan.dtmf' delay=0.003155
thread=0x28755e0 'Engine Worker'
data=0x7f874c0dced0
retval='(null)'
param['id'] = 'sip/1515731'
param['text'] = '4'
param['detected'] = 'inband'
param['handlers'] = 'sip:10,pbxassist:15,conf:75,sip:100,dumb:100,callfork:100,filetransfer:100,wave:100,iax:100,jingle:100,analog:100,mgcpgw:100,sig:100,yrtp:150'
param['sequence'] = '1'
param['duplicate'] = 'false'
param['module'] = 'sip'
param['status'] = 'answered'
param['address'] = '10.11.255.249:64989'
param['targetid'] = 'sip/1515732'
param['billid'] = '1677205349-772582'
param['peerid'] = 'sip/1515732'
param['lastpeerid'] = 'sip/1515732'
param['answered'] = 'true'
param['direction'] = 'incoming'
param['domain'] = '10.11.255.131'
param['callid'] = 'sip/R3ArPBnexQwoArpH35rEcA../7665b20a/1797993596'