We have found one software suitable in our database for this conversion.
Nokia Sound Converter from certain versions of Nokia Suite should be able to convert NRT ringtones for use in MMS multimedia message Service, i.e so you can send the audio via MMS. Seems probably old conversion that people needed years ago.
Updated: September 16, 2020
NRT
Files with nrt suffix can be found as ringtones for some older Nokia mobile phone devices.
MMS
Files with mms extension can be most often found as multimedia messages saved in special Multimedia Messaging Service message file format. An .mms file stores multimedia objects (images, audio, video, rich text) sent through mobile phones with MMS support.
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