Programs like Awave Studio support huge number of various audio formats, including GSM and RTTTL formats. You can use it to convert or save one .gsm files to .rtttl, should you need it. However, that format seems to only work in Nokia phones.
Convert GSM sound file to RTTTL / Nokring mobile ring-tone format.
We found one software available in the database for this conversion.
Microsoft Windows software - convert gsm to rtttl on Windows
Audio editting software with huge format support
Convert from gsm file format
|Yes, Awave Studio supports gsm file conversion as a source file type.||Yes||No||No||No||No||No||No|
|Yes, Awave Studio supports rtttl file conversion as a target file type.||No||No||No||No||No||No||No|
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.