Documentation of OnSIP’s quality of service is available in the OnSIP Knowledgebase. Quality can be further improved by implementing packet prioritization locally. To deliver great quality of service, OnSIP sets sensitive voice packets to either 0x18 (Low Delay and High Throughput) or 0x10 (Low Delay) (as defined by RFC 791, an international protocol specification). If a company expects to have 20 calls at the same time, the company would ideally have 20*100kbps (or roughly 2Mbps) dedicated to these calls. The Internet speed or bandwidth required for use with OnSIP will depend on the number of simultaneous calls that an organization expects at any given time. We've found that network stability (no or low values of packet loss, jitter and latency) tends to be more important to VoIP implementations than Internet speed. Network quality, including the above factors, can be tested using our VoIP test or other free online tools. The effects of jitter can be mitigated by storing voice packets in a jitter buffer upon arrival and before producing audio, although this increases delay. Jitter greater than 5ms can increase latency and result in packet loss. Jitter is often caused by network congestion or route changes. Jitter: Jitter measures the variation of packet arrival times, or how much latency varies within the network, measured in milliseconds (ms).Obviously, the lower the latency, the better off you are (100ms is acceptable, while higher than 150ms will start affecting quality). Latency: Latency is the time it takes a data packet to reach its destination, measured in milliseconds (ms).Lost packets result in gaps and stutters in communication, but it is usually not a big concern with broadband networks. Packet loss: Packet loss occurs when some voice packets drop off due to congestion, increased traffic through the network or incorrectly configured hardware.The quality of the phone call also depends on the quality of the network. Video calling, conferencing and other forms of communication may require anywhere from 3 to 20 times as much bandwidth, depending on the desired quality and number of participants. VoIP typically requires anywhere from 24kbps to 90 kbps (~100 kbps would be ideal). VoIP requires an Internet connection of a certain speed (bit/s) to carry voice as data. Evaluating Your Networkīandwidth is the measure of the resources consumed during an Internet transmission. A question often asked is: ‘What infrastructure do I need to get started with OnSIP VoIP service?’ The world of the Internet, clouds, networks and communication is fraught with complicated terminology, so I’ll try to distill the basics down to an easily digestible version.
0 Comments
Leave a Reply. |