VOIP stands for voice over internet protocol, which allows you to make phone calls using a computer network over the internet. VOIP technology compress the sound waves or digitalize into IP packets transmitted over the network.
There are many benefits gained by the organisations, residential or individual remote workers. A few of them are…
- Cost effective
- Easy to setup
- Highly accessible
- Supports all platforms
- Crystal clear voice
- Supports multitasking
- Supports any device.
Basic system components of VOIP:
The four most important VOIP components are…
- Media gateway
- Signaling gateway controller
- Media server
- Application server
1. Signalling gateway controller:
- Signalling gateway controller (SGC) is also referred to as an agent as it controls calls function.
- It is the heart of the VOIP platform as its main role is to connect to the public switched telephone network with the Internet protocol. The main characteristics of the signalling controller:
- Supports SS 7 signalling system 7 protocol stack refer to the public switched telephone network main signalling protocols suit.
- Supports voice call control protocols such as SIP general report your IP signalling protocols.
- Supports media control protocols such as mg CP which is used for controlling BDA gateway session connections and parameters, hence it is called media gateway controller because of its media gateway control function.
- Generates call detailed records which is used for billing purposes.
- Provides bandwidth management control which allows new sessions to be admitted in the system
- Supports bandwidth policy mechanism which is used to media flow profiles and also preserves appropriate quality of service levels. It helps to instruct the media gateway to monitor the RTP media flow.
- Allocates connection characteristics, for example, coding and IP packaging used better media resources.
- Allows multitasking and multiprocessing
2. Media gateway
The main role of the media gateway is to transmit the voice packets following the rtp transmission protocol used for convergence of public switched telephone network or IP network such as packetization transmitted over the network.
- Transmits data over the Internet
- Controls call flows under the observation of the media gateway controller
- Supports transferring voice in SF 7 networks
- Supports different compression algorithms
- Supports and manages digital signal processing resources.
- Available for maintaining redundant IP link
3. Media server:
A media server is used for video conferencing or voicemail and also for special tones or announcements that need to be transmitted over the internet. The main functions are…
- Voicemail functionality
- Transmissions of tones
- Voicemail to email transmission
- Activates voice dialling
- Supports IVR
The main server is controlled by an application server using SIP protocol routing towards the media gateway existing.
4. Application server:
Application server provides value-added services to the IP network and also call specifications, characteristics are also valuated.
- Supports customization in private dialling plans.
- Second, basic services such as call forward, call forward on busy, call waiting, call transfer, call park and voicemail are offered by the application server.
- Advanced features such as call authorization using PIN, remote office, “follow me” plans are offered.
- Delivers CDR’s call detailed records
- The Application Server is the brain of the VoIP architecture.
- It communicates with the Signalling Gateway Controller through protocols such as H.323 or SIP.
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