VoIP, or “Voice over Internet Protocol” refers to sending voice and fax phone calls over data networks, particularly the Internet. This technology offers cost savings by making more efficient use of the existing network.
Traditionally, voice and data were carried over separate networks optimized to suit the differing characteristics of voice and data traffic. With advances in technology, it is now possible to carry voice and data over the same networks whilst still catering for the different characteristics required by voice and data.
Today, phone networks are on a migration path to VoIP. A VoIP system employs a packet-switched network, where the voice signal is digitized, compressed and packetized. This compressed digital message no longer requires a voice channel. Instead, a message can be sent across the same data lines that are used for the Intranet or Internet and a dedicated channels is no longer needed. The message can now share bandwidth with other messages in the network.
Normal data traffic is carried between PC’s, servers, printers, and other networked devices through a company’s worldwide TCP/IP network. Each device on the network has an IP address, which is attached to every packet for routing. Voice-over-IP packets are no different.
Users may use appliances such as Symbol’s NetVision phone to talk to other IP phones or desktop PC-based phones located at company sites worldwide, provided that a voice-enabled network is installed at the site. Installation simply involves assigning an IP address to each wireless handset.
VOIP lets you make toll-free long distance voice and fax calls over existing IP data networks instead of the public switched telephone network (PSTN). Today business that implement their own VOIP solution can dramatically cut long distance costs between two or more locations.
1 comments: on "Voice Over Internet Protocol"
VoIP works well mainly on ADSL or Cable modem and a backbone internet that is over provisioned or using IP V4 Diff services or IP V6 RSVP.
It is not in Telstra's interest to support VoIP it reduces their POTs (Plain Old Telephone) revenue and seeing they own most of the backbone internet they can do something about it.
They have two choices:
1. Block RTP, the internet protocol that carries VoIP. This would cause big stir and negative publicity, so it unlikely that they would do this.
2. Invert the prioity on the RTP packets this would add large latency to the delivery of RTP packets and cause VoIP to be unusable. Telstra runs a best effort Internet and does not gurantee prioity of RTP.
If you want usable VoIP connect to a network where it is in their interest to provide at least IP V4 Diff services.
Recently I just came across a good article on Voice Over IP
Here is its link.
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