We have a few options for on-hold, see below.
The account comes with standard on-hold music available from our music library.
Personalized on-hold audio is also available as an add-on feature, it's $9.99 a month for the whole account (can be removed at any time as it is a month-to-month service). We accept both MP3 and WAV files, all that's needed is the "okay/go ahead" along with the attachment and we can place the order.
If you are a current GreenLink customer and want to proceed with adding personalized on hold they can email firstname.lastname@example.org including the recordings WAV or MP3 that you want on your on-hold settings.