The inpereter sits or stands next to the client, transferring to them whatever is spoken / heard, in their own language. A one-way interpreting, usually found in speeches or conferences.
The interpreter holds a conference (video)call with the client and the other parties, consecutively transferring all speech into the respective language and helping them to communicate.
The interpreter uses an interpreting cabin and audio equipment so as to transfer what is said / heard to the recipients, in their language. Interpreters are engaged in couples per language pair.
The interpreter accompanies the client to any event, transferring to them in their own language, any hearing or conversation that they may engage in.
... per interpreter, per hour of employment. Interpreters work for up to 6 hours per day. In the case of a conference that lasts for more than 3 hours, 2 pairs of interpreters per language pair are required.