Similar to ISDN

Chromebook

CLIÉ

CLU (programming language)

Cosmic Background Explorer

CoffeeScript

Common Lisp

Lockheed CP-140 Aurora

Caudron C.714

Cray X-MP

Cromemco Z-2

IBM Cross System Product

Adaptive Multi-Rate Wideband

Connectionless-mode Network Service

Common Management Information Protocol

E.164

FTAM

G.711

G.718

G.719

G.721

G.722

G.722.1

G.723

G.723.1

G.726

G.728

G.729

G.729.1