how to send DTMF tones over sinch javascript web to PSTN calls? -

i have been looking long time cannot find regarding little quest of mine. have implemented sinch sdk system , calling fine. i'd send dtmf tones if call answered pabx.

hi on call object there senddtmf method dtmf key must in [0-9, #, *, a-d]. ios:

[call senddtmf:@"1"]; 

https://download.sinch.com/docs/ios/latest/reference/html/protocols/sincall.html#//api/name/senddtmf:

android

call.senddtmf("1");