What does X stand for?

Telephone Extension

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Samples in periodicals archive:

It also supports features such as video conferencing, web collaboration, stereo call recording and the integration of geographically remote telephone extensions.

New VoIP Phone System launched by Telappliant

It also supports features such as video conferencing, web collaboration, stereo call recording and the integration of geographically remote telephone extensions.

New VoIP Phone System launched by Telappliant

The five patents awarded to Phonex Broadband over the last 12 months include two international patents: Multiple Access Systems on Telephone Extension Systems, patent number 2,119,378 from the Canadian Intellectual Property Office, which conducts multiple access simultaneous telephone communications in full duplex either over power lines or via common RF transmission; and Secure Access and Telephone Extension System and Method, patent number 196,492 from the South Korean Patent Principal Register.

Phonex Broadband is Awarded Five New Patents for Its Power Line ...