BT is replacing its infrastructure costing billions of pounds to make it a full IP based network to carry VOIP and data services, BT wants to provide technology where you plug in a device and use it on their network such as internet displays, even a mobile phone eseque handset will be available to plug in to your pc and make calls...
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Internet Telephony or Voice over the Internet or Voice on the Net †“ Mainly used by residential users with PCs (and perhaps USB handsets). PCs with telephony software dial up to the Internet where calls bypass PSTN tolls, but have no guarantee of end-to-end voice quality. BT PC2UK and BT Netchat are examples of this type of product.
Voice-over-IP †“ Traditional digital TDM phones connected to a PBX which itself is connected to a gateway, which turns TDM speech into IP for transport over an IP VPN or ATM WAN. MM VOIPâ₠¬Ã¢â€žÂ¢s sister product, BT VoIP Port is an example of a VoIP product.
IP Telephony (IPT) †“ IP Phones on the desktop, IP applications, IP transport of voice, video, and data over a privately owned IP VPN or ATM WAN. IP PBX hosted by a Carrier, or Service Provider, or Customer, often located within the enterprise. Cisco's Call Manager is an example of an IP Telephony product.
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