I work for a group of dental companies who have had their on hold messaging looked after by Telemall Audio for nearly 2 years. I've been very happy with the service. Our on hold messaging sounds fantastic and it's very easy to request edits and seasonal updates.

(No, they did not ask me to write a review for them! :) )

I've found Telemall to be very affordable, producers of great sounding audio promotions and providers of very easy to implement solutions.