Transcription of telephone calls

Hello! I am looking for someone to help me with a project. I need to have an application to tanscribe telephone calls in order to fulfill market research analysis requirements. Time stamping is not necessary for the transcriptions, nevertheless it's importante to identify the different speakers/participants in the call.
The calls are all less than 30 minutes in length. If you have experience in transcription work then I would be grateful if you would consider this project!