This paper focuses on the analysis of the general and specific features of various telephone conversation openings which happen between strangers.

A typical aim here is to gain a better understanding of cross-cultural communication through a comparative study of diaphonic repetition in Chinese and American students telephone conversations.

The research in this paper is a study of the private telephone conversations of a Chinesewith the variation theory as the theoretical guide and Hymes’ ethnography of speaking theoryas the framework for analysis.

This thesis attempts to make a comparative study of the opening of conversation in English and in Chinese from a socio-pragmatic perspective.

First, it describes the social functions and sequences of formulaic language, telephone openings and small talks.

Design and realization of conference telephone system based on LAN;

The paper introduces the main functions of RDC-1 Railway Digital Conference Telephone equipment and it s field testing.

Analysis and Amend Wireless Anonymous Conference Call Authentication Protocols;

The conference call is summarized and classified at first,then a full duplex conference by booking is discussed.

It also provides usage description of EPD tool,and introduces in detail the coding/decoding,algorithm,characteristics,and implementation method of conference call.