Comment on How to (actually) send DTMF on Android without being the default call appparentComments−shakna1yDTMF [0] which also points to SDP, along with the tel scheme RFC [2]. It's a bit of a rabbithole to find what exactly is supported.[0] https://www.rfc-editor.org/rfc/rfc4733#section-2.4.1[1] https://www.rfc-editor.org/rfc/rfc3555#section-3[2] https://www.rfc-editor.org/rfc/rfc3966#section-5.1.3
Comments
DTMF [0] which also points to SDP, along with the tel scheme RFC [2]. It's a bit of a rabbithole to find what exactly is supported.
[0] https://www.rfc-editor.org/rfc/rfc4733#section-2.4.1
[1] https://www.rfc-editor.org/rfc/rfc3555#section-3
[2] https://www.rfc-editor.org/rfc/rfc3966#section-5.1.3