Custom (telephone) hold music with voice over

I need an audio file with a voice over that must be in a particular format. This file is for custom hold music for use with my telephone system and the phone company told me the audio file must specifically be in one of the below formats. I want some very easy listening elevator music with a voice over (american accent): "Thank you for calling Classic Towing. We apologize for the wait. A representative will assist you as soon as possible." This message should repeat every so often, but not so much it irritates people to death.

- Microsoft PCM 16-bit, signed, little-endian: channel 1 or 2; sample rate 44100, 22050, or 16000

- Microsoft PCM 8-bit, unsigned, channel 1: sample rate 22050, 11025, or 8000

- Microsoft u-law 8-bit, channel 1, sample rate 8000