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Each PBX-connected station, such as a desk phone, cordless phone, or a fax machine, is often referred to as an extension and has a designated extension telephone number.
An analogue phone line is limited in terms of features compared to ISDN or VoIP, and is also the most expensive in terms of line rental cost. (Currently €20.96 Ex. VAT per month)
A Basic Rate ISDN line provides 2 voice channels when connected to a telephone system. Multiple Basic Rate ISDN lines can be combined to provide 4, 6, or more voice channels if required. (Line rental is currently €32.51 Ex. VAT per month or €16.25 per channel)
A Fractional Rate ISDN line provides 16 voice channels when connected to a telephone system. (Line rental is currently €166.50 Ex. VAT per month or €10.40 per channel)
A Primary Rate ISDN line provides 30 voice channels when connected to a telephone system. (Line rental is currently €277.06 Ex. VAT per month or €9.23 per channel)
SIP trunks provide all the same features as ISDN trunk lines, powerful call setup and routing, faster setup and tear down of calls, and superior audio fidelity compared to analogue PSTN lines.
While SIP trunks are the most cost effective type of trunk lines available, costing less per channel than ISDN or analogue PSTN lines, usually with free landline calls and low cost mobile rates included, a good quality broadband connection is essential for SIP trunks to be a viable solution for business.
VoIP systems employ session control and signalling protocols to control the signalling, set-up, and tear-down of calls. They transport audio streams over IP networks using special media delivery protocols that encode voice using audio codecs. Various codecs exist that optimise the media stream based on application requirements and network bandwidth; some implementations rely on narrowband and compressed speech, while others support high fidelity stereo codecs. Some popular codecs include μ-law and a-law versions of G.711, G.722, which is a high-fidelity codec marketed as HD Voice by Polycom, a popular open source voice codec known as iLBC, a codec that only uses 8 Kbit/s each way called G.729, and many others.