This post is short and simple: your mp3 or ogg files played on VoxEngine scenario level with call.startPlayback or using Player will be played on the Web or Mobile SDK side in HD quality (48KHz), or on SIP side if it does support wideband audio codecs (Speex or Opus). It also appeared that Opus has 3 encoding presets - auto / speech / music, currently we use auto, but maybe we will let developers decide which preset can be used on VoxEngine scenario level later.

Comparing Chili Piper and 6 Competitors: A Detailed Review
Chili Piper is popular, but is it the best for you? This article compares it to competitors like Dashly, Calendly, and others, examining features, pricing, and ideal use cases. Discover the right scheduling tool for your team's needs.