Covering the principles of voice transmission to provide an understanding of the requirements to be met to successfully transport voice over an IP network.
This is an architectural description defining the use of a number of protocols and specifying a range of components - all of which are explained. These are Terminals, Gateways, Gatekeepers and MCUs.
Voice over IP
Introducing the RTP and RTCP protocols that are used for the transport of voice and looking at QoS requirements and the various methods used to achieve QoS.
The SIP protocol is explained and the function of SIP Agents and Servers is defined. SIP addressing and messaging is dealt with in detail.
Explanation of a softswitch in terms of Call Agents and Media Gateways. This covers MGCP and GCP/H.248.1 protocols, their protocol stacks and their commands and setup sequences.
SIP-T/SIP-I and SIGTRAN
This chapter covers what SIP-T/SIP-I is and what it does, SIP call flows and SIP bridging. It then goes on to discuss SIGTRAN and its protocol layers.
This includes use of a protocol analyser and soft phones to view H.323 and SIP signalling and Encoded Audio Streaming.