Conversion of m4a files to rtttl file format

With some dedicated audio editing programs like the Awave Studio or even some ringtone maker it should be possible to process common audio files (like the .m4a) and export it to some ringtone formats including RTTTL Nokring ringtones (.rtttl).

Open M4A file    Open RTTTL file

Related software

Awave Studio icon

Awave Studio

Audio editting software with huge format support