SIP (Session Initiation Protocol) – a modern alternative to traditional telephone service, based on the connection protocol SIP, which enables telephone (digital voice) to the computer network technology VoIP (Voice over IP).
SIP-telephony – a kind of telephone services on the access channel to the Internet. The only necessary condition – the connection speed must be at least 64 kbit / s. As a result, SIP – phone is available to you anywhere there is Internet access. It contributes to a significant reduction in the cost of telephone and significantly extends the communication possibilities.
For SIP-telephony There are 4 ways to connect:
1) or a laptop computer with special software, equipped with a network card, headphones and microphone;
2) SIP-phone – landline or mobile;
3) mobile phone or smart phone – if it supports SIP or has the ability to install on it the appropriate software;
4) analog phone using SIP – adapter.
ISDN (Integrated Services Digital Network) – Digital Network Integrated Services, which allows you to combine telephony services and data exchange.
Using the digital ISDN network allows you to combine data exchange and telephone and provides the information, images, video, and integrated telecommunications data over a wired telephone line.
Applications include ISDN-speed image processing system (such as a facsimile Group 1V), additional telephone lines in homes to serve the industry of remote access, high-speed file transfer and video conferencing.
ISDN – phones provide instant communication with one of a number of preassigned subscribers anywhere in the world at the touch of a button. Another possibility – displaying the telephone number of the caller’s name and address on the display when you call. In a more complex version, when the phone is connected to a PC, the PC monitor can display the corresponding entry on the caller from the database.
PRI (Primary Rate Interface) – is standard interface ISDN network and the use of technology ISDN, PBX allows you to expand opportunities and create a multi-channel communication up to 30 channels simultaneously. ISDN PRI technology allows to increase the capacity of the PBX optimally implement internal communications or to ensure the work of call-center.
SIP Trunk– this phone line, supplied to you via an IP network over SIP protocol. Using the standard protocol, the telecommunications company connects to your PBX one or more voice channels. Phones that you appoint a telecommunications company, called DID (Direct Inward Dialing) numbers and can be assigned (“attach”) to the SIP trunks. In many countries of your existing phone numbers can be transferred to the DID and “attach” to the new SIP trunks.
Select the suitable softphone, which can also be downloaded below.
Zoiper – softphone that supports IAX protocol and SIP. Proprietary. There are paid and free versions. There are versions for Linux, Mac OS X and Windows.
Setting instructions Zoiper.pdf
X-Lite – a popular softphone that uses SIP. Free. There are versions for Linux (2.0 only, without video support), Mac OS X and Windows.