用来作为linux中SIP SERVER,完成VOIP网络电话中服务器的功能

				-- SQL script for PDT module												USE pdt;								-- create table				CREATE TABLE admin(					name VARCHAR(20) NOT NULL PRIMARY KEY,					passwd VARCHAR(20) NOT NULL DEFAULT ""				);								CREATE TABLE authentication (					username VARCHAR(50) NOT NULL,					domain VARCHAR(50) NOT NULL,					passwd_h VARCHAR(32) NOT NULL				);								INSERT INTO admin VALUES ("admin", "admin");