addressing, communicating (with), contacting, getting, reaching
getting through (to)acquainting, advising, apprising, briefing, clueing(or cluing), enlightening, familiarizing, filling in, informing, instructing, notifying, telling, wising (up)buzzing, calling, phoning, ringing (up)(chiefly British), telephoningkeeping up (with)
getting in touch with(or keeping in touch with), touching base (with)