with Opus support brings the same elegant look and feel of the previous T4 Series models, but with the added bonus of enhanced performance at no added cost. With key upgrades such as Opus support and enhanced speaker performance, the new T4S series are a powerful work tool. The T4S Series brings power to the table with the popular Opus HD audio codec that is an advantage in the carrier/ITSP market. The T4S Series are future proof with higher hardware support that brings the latest hardware components to allow the phone to support future firmware generations. That way as Yealink continues to add more powerful features to the phone’s firmware, you’ll be able to keep up, worry free. The firmware for the T4S series allows for a unified firmware across all models (T41S, T42S, T46S, T48S) for easier and more convenient management and provisioning.