acoustical telephony

TPON Telephony over Passive Optical Network

TMS Telephony Management System

TMN Telephony Management Network

telex telephony

Telephony voice card

telephony user interface

telephony system

telephony services API

telephony server API

telephony passive optical network

Telephony Interface Card

Telephony Communication

telephony application program interface service provider

telephony application program interface

telephony API

Telephony

TAPI Telephony Application Programming Interface

switching telephony