E

Ear and Mouth (E&M)

An analog interface present in many of today's PBX systems.

Erlang

One solid hour of conversation (that is, 60 minutes of phone usage).

Extended Superframe

A grouping of 24 standard 193-bit frames into a single frame.

extensible markup language (XML)

A programming language that offers an alternative method of sending text and pictures over a network, as opposed to HTML.