Network Working Group A. Terzis Request for Comments: 2745 UCLA Category: Standards Track B. Brade
Network Working Group D. AwdUChe Request for Comments: 3209 Movaz Networks, Inc. Category: Standar
Network Working Group S. Herzog Request for Comments: 2750 IPHighway Updates: 2205 January 2000 Ca
Network Working Group M. Pullen Request for Comments: 2490 George Mason University Category: Infor
Network Working Group L. Berger Request for Comments: 2380 FORE Systems Category: Standards Track
Network Working Group E. Crawley, Editor Request for Comments: 2382 Argon Networks Category: Infor
Network Working Group F. Baker Request for Comments: 2206 Cisco Systems Category: Standards Track
Network Working Group L. Berger Request for Comments: 2207 FORE Systems Category: Standards Track
传统的电话业务使用模拟技术，最大缺点是只能够在专用的网络上进行传输，通话双方之间的电路被独占。所以传统电话业务的成本较高，并且其业务范围也受到了地域的限制。 IP电话由于不受电路交换方式的限制
传统的电话业务使用模拟技术，最大缺点是只能够在专用的网络上进行传输，通话双方之间的电路被独占。所以传统电话业务的成本较高，并且其业务范围也受到了地域的限制。 IP电话由于不受电路交换方式