Music on hold

Music on hold is what callers hear while they wait — parked, held, in a queue, or on a conference bridge. Exovo plays it from a system-wide library you manage in one place.

Managing tracks

Admin → System → Music on Hold. The Music Files tab has ten numbered slots; for each, Upload a .wav or .mp3 track (WAV as PCM, 16-bit, mono, up to 10 MB each) or Clear it. FreeSWITCH plays every uploaded track. Uploads and removals don't take effect until you press Save.

HD hold music

Hold music is streamed at three rates at once — 8 kHz, 16 kHz and 48 kHz — and every call hears the one that matches it: 48 kHz in the web client's softphone (Opus), 16 kHz on HD desk phones (G.722) and in the Exovo app (Opus or G.722, heard at 16 kHz), 8 kHz for most callers from the phone network (G.711).

An outside caller can hear HD too when the carrier carries it end to end. For example, Telnyx's HD Voice number feature delivers wideband to AT&T, T-Mobile and Verizon mobiles on LTE/5G (US numbers). It needs Opus or G.722 on the trunk, which Exovo offers by default. A track is heard at up to its own quality, so an 8 kHz upload stays 8 kHz everywhere.

For WAV, 16 kHz is a good balance: about five minutes fits in 10 MB (48 kHz fits under two). Use MP3 for longer tracks.

Under Playback Options:

• Randomize playback — shuffle the track order instead of playing through in sequence.
• Randomize per call — give each caller a different random order.

Playlists

The Playlists tab groups tracks into named sets, each backed by its own audio stream with a per-playlist Volume, Auto Gain and Shuffle. Add a playlist, name it, add its WAV/MP3 files, and it becomes selectable as a hold-music source — handy when you want different music for a sales queue than for the front-desk park.

Where it's used

The hold-music selection appears wherever a caller can be made to wait:

• Call parking — the music a parked caller hears (Admin → System → Call Parking).
• Call queues — per-queue hold music, under the queue's Voicemail & Messages.
• Held calls and conference bridges.

Each of these pickers also offers System music on hold — the default stream — so a queue or park falls back to it cleanly when you haven't chosen a specific track or playlist.