VOCAL or Vovida Open Communication Application Library is a free and open source software library which lets a user running a Linux operating system to use a complete freely available system even with source code for all its call relating operations like Call making, Routing a call, Billing information etc for both small system and also for Enterprises..
Details about Open Source Project -VOCAL
Since the system is an open source, anybody can see what's the internal of the software and how it makes it possible to convert a simple desktop computer to a VoIP system which can make calls and provides most functionality of a VoIP system. Vovida Networks (think of Voice, Video, data) which is now integrated in Cisco has developed the library for the purpose which is known as VOCAL.
Converting to a VoIP system Using VOCAL
Authors of the book have clearly tried their best to provide more useful content in a very simple manner as it is one of the good books anyone can read about converting a computer network into a VoIP system without buying much expensive software's as VOCAL is free from any kind of royalties. Not only free, but being an open source software, VOCAL is most popular among Linux users.
Complete technical details about conversion of a simple network to a VoIP network
Practical VoIP using VOCAL provides step by step instructions on converting an existing computer or a computer network into a VoIP network which can be used to dial calls or provide a functionality offered by any VoIP network. Where most of other books in this area just provide details about VoIP, The authors have differentiated themselves by actually providing complete details of such conversion from simple network to a VoIP network.
Details about protocols such as SIP, SDP, RTP, MGCP and SNMP
The authors does not stops after merely providing details of such conversions but also clearly enlighten the reader's mind by providing in-depth details about various VoIP protocols used in VOCAL such as Session Initiation Protocol (SIP), Session Description Protocol (SDP), Real Time Transport Protocol (RTP), Media Gateway Control Protocol (MGCP), Simple Network management Protocol (SNMP) even with diagrams and flowcharts are provided. Various other technical terminology like Redirect server, SIP user agent, Unified Voice Mail server are also explained in details which are a great effort for authors part.
Must for Linux users
This book is a must for all Linux users who are interested in using VOCAL to develop a VoIP system for their own or for networks manager who wants to extent VOCAL limits to bring upon a much superior VoIP system in their enterprise.
