First, it offers a short/medium term arbitrage opportunity. This means that for example it is cheaper to make an IP telephony call than a circuit call because the operators avoid paying interconnect charges.Second, because of engineering economics: A circuit switched telephony call takes up 64
Interoperability In Voice And Data Integration
Wireless is a term used to describe telecommunications in which infrared, radio, or other electromagnetic waves, rather than some form of wire, carry the signal over part or the entire communication path.
KBPS while an IP telephony call takes up 6-8 KBPS.
IP telephony will also create great demand for new services. Tools used to accomplish these goals are defined here:
• Traffic shaping
• Call admission control
Types of voice/data integration
The strong pressures driving the integration of voice and data networks have resulted in various solutions to the
Three general approaches are:
Goals of VOIP
• To Provide an overview of technologies and applications of integrated voice/data networking.
• Understand the specific protocols involved in voice/data networking.
• List Specific network engineering challenges and solutions associated with the integration of voice and data.
• Voice over ATM
• Voice over Frame Relay
• Voice over IP
• One of the most recent and exciting technologies today is Voice over IP (VOIP).
• VOIP is also known as IP Telephony is a method developed to transmit packetized voice and data over packet switched networks using the Internet Protocol.
VOIP Network Design Constraints
After voice has been compressed and converted to data, the next step is to put it into a Real Time Protocol (RTP) stream for transmission across an IP network.
Advantages Of Voip
1. First, it offers a short/medium term arbitrage opportunity.
2. Second, because of engineering economics: A circuit switched telephony call takes up 64 KBPS while an IP telephony call takes up 6-8 KBPS.
3.Third, it offers exciting new added values in the long term.
4. Lastly, IP telephony gives carriers ability to manage a single network handling both voice and data.
Future Challenges For Voip
The main problems with the VOIP technology as it is today are the interoperability, security, and bandwidth management issues.
Problems encountered in VOIP Interoperability
All three problems arise from the lack of a single standard being adopted by the software and hardware vendor companies commonly found in voice networks (terminals, gateways, and gatekeepers).
Companies also face problems with interoperability when attempting to use PC-based products such as Microsoft Corp.’s NetMeeting or VocalTec Communication’s Internet Phone Again. Security
Other problems with VOIP as it exists today revolve around the issue of security - a high priority for and company or university.
Solution to Interoperability
Data are shared, entered once and transferred seamlessly between platforms and among applica-tions
Achieving Interoperability with IP
The network is the core of a public safety communications system and the heart of a true interoperability solution. Today's most ubiquitous standard for exchanging information is Internet Protocol (IP).
Interoperability Benefits of an IP Network
An IP-based communications network allows various agencies, using multiple brands of radios, to seamlessly communicate .Specific benefits include:
Dynamic Re-grouping - This feature allows disparate agencies at the scene of a crisis to communicate on the same "talk group."
Mobility Management - Radios can be logged onto, much like a computer, with all radios recognizing individual settings.
Quality of Service for VOIP
Tools used to accomplish these goals are defined here:
• Policing—Provides simple limiting of packet rate, often by simply dropping packets that exceed thresholds to match capacities between different network elements.
• Traffic shaping—Provides the capability to buffer and smooth traffic flows into and out of devices based on packet rate.
• Call admission control—Provides the capability to reject requests for network bandwidth from applications.
• Queuing/scheduling—These are used with buffering to determine the priority of packets to be transmitted.
• Tagging/marking—Includes various techniques to identify packets for special handling
Fragmentation allows the smaller voice packets to be inserted within gaps in the larger packet.
The main reason being that VOIP allows for telephone calls to be made over the internet, thus eliminating the cost of long distance phone charges that the phone companies charge of long distance phone calls. VOIP technology will revolutionize the telecommunications industry and if used properly can create many positives for companies and private individuals alike.