Here is a brief overview of the different features and functions that PTT accessories can provide. When it comes to extending the capabilities of a mobile device or a PTT app, there are not many possibilities to do so with wired accessories regardless of having a light headset or remote speaker microphone (RSM). The reason is the analog connection via the 3.5mm audio connector, which doesn’t allow for more than audio and the PTT signal. Bluetooth accessories provide a digital connection which can theoretically send an almost infinite number of commands to the phone or app matching the feature set provided within the PTT ecosystem.
The PTT accessory seems to get less attention in terms of proper testing and verification of requirements than the mobile device. It is understandable that the PTT app is the centerpiece of the PTT over LTE project as the platform for communication, and therefore has a longer evaluation cycle during the evaluation phase. Often the only checkbox for the PTT accessories is compatibility to the mobile device and PTT application but there is far more to consider otherwise the PTT accessory can become a costly and administrative nightmare.