可视 ('viewable') +
电话 ('telephone') — literally 'viewable phone'. A 1990s/2000s technical term that today usually means a video call (
微信视频, FaceTime). For modern app-based video chat people more often say
视频通话 (shìpín tōnghuà);
可视电话 still appears in industry, government, and prison-visitation contexts.
