telephonic

[ tel-uh-fon-ik ]

/ ˌtɛl əˈfɒn ɪk /

of, relating to, or happening by means of a telephone system.

carrying sound to a distance by artificial means.

Origin of telephonic

First recorded in 1825–35; tele-¹ + -phone + -ic

tel·e·phon·i·cal·ly, adverb non·tel·e·phon·ic, adjective non·tel·e·phon·i·cal·ly, adverb pre·tel·e·phon·ic, adjective

At some automatic fire-call points a few signals can be given, at others, a telegraphic or telephonic transmitter can be applied.

Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 4 |Various
We were in telephonic communication with Dover via a lighthouse in the vicinity of our anchorage.

The Blocking of Zeebrugge |Alfred F. B. Carpenter
Telephonic communication has been established between his house and the telegraph office in Dover.

Sketches of Successful New Hampshire Men |Various
The telephonic communication being cut by the enemy's fire rendered communication between the front and the rear most difficult.

New York Times Current History; The European War, Vol 2, No. 2, May, 1915 |Various

His one desire now was to put himself in telephonic communication with New York, but he did not dare to be too pressing.

Out of the Ashes |Ethel Watts Mumford