A pilot who requests flight following (VFRtraffic advisories) or who flies IFR on a cross-country can expect to talk to a number ofATC controllers. Each controller works a sector of airspace, and as a pilot approaches theborder between sectors, the controller instructs him (or her) to contact the nextcontroller on the appropriate frequency.
This is a companion discussion topic for the original entry at https://www.avweb.com/flight-safety/check-in-time-how-to-report-to-atc