On-site recordings cover all speech recordings that are performed at one or a limited number of recording sites. They have the advantage that the quality of the recorded signals can be controlled without restrictions. For instance you may use a wide range of low cost to high quality microphones in an on-site recording session.
Basically an on-site recording setup may have all possible setup features as listed before. Aside from that you should distinguish between
On-site recordings require more manpower than telephone recordings (for scheduling and supervision). Also, in most cases there are only a few recording rooms available (while in a telephone recording many calls can be handled in parallel) and therefore more time should be allotted to the collection phase. On-site recordings in different locations require careful planning and training of the different crews to avoid recording site specific differences in the data. Be sure that exactly the same hardware is used in all locations. Also the monitoring should be performed by one central institution only.