The Twilio Client JS SDK 1.7 has been released with support for Opus, a codec that delivers better audio quality in various network environments, compared to the current supported codec G.711 (PCMU). The new Codec Preference API allows developers to control which codecs to use and set Opus as the preferred codec. This release enables superior voice quality at less than half the bandwidth required by G.711, making it a recommended upgrade for Twilio Client JS users.