Design and Implementation of VoIP packet communication system

This article focuses on a group of software modules for VoIP communication system design approach and trying to explain the details of the development of the protocol family using specific software design and source code ( and SDL diagrams , etc.) , and the essence of the system-level network communication protocol design thinking method . In order to take into account the network data communication , voice communication systems , network communications software, systems and software implementation technology , this article focuses on the introduction of the agreement system-level analysis , the description of the principle and realization of software programming . Because of the enormous scale of the paper 's source code and documentation resources , writing trade-offs can only be based on the resources of the importance, complexity and integrity . Chapter 1 Introduction to the system ; Chapter 2 to Chapter 4 explain the IP, TCP, routing ( Part 1 ) ; Chapter 5 to Chapter 9 to explain the RTP / RTCP , RSVP, RAS , call signaling protocols and media control protocol ( part 2 ) . Part 1 focuses on the basic support protocol suite for packet voice communication system ; Part 2 the senior protocol suite for packet voice communication system . About focus is to put forward the overall structure of the voice communication system protocol suite ; discussion focused on IP- head function , slicing / restructuring ; discussion focused on the TCP sliding window ; discussion focused on routing dynamic routing agreement. The discussion focused on RTP / RTCP head functions , commonly used algorithm ; discussion focused on RSVP protocol principles ; RAS discussion focused on the implementation framework ; discussion focuses on the call signaling protocol agreement process and implementation methods ; the discussion focused on the media control protocol is the realization of the main exchange from identifying and capability set . In all relevant discussions , using a total of about 60 of the charts and the 1290 line C / C source code .