A PRI Line is a Digital Trunk Line that is provided by a Telecom service provider which enables users behind a PBX to make 30 simultaneous incoming/outgoing calls using a single line. A PRI Card is used to connect PRI lines to IP PBX/ IP Telephony Server so that all the IP Phones/ Analog phones (extensions) can make outgoing calls or receive incoming calls using it.
The generic PRI Cards are generally vendor neutral and they are inserted into PCI 3.3V/ PCI 5V/ PCI Express (empty) Slots in the server. There are different PRI Cards for each type of PCI interface.
One PRI Card can have 1,2 or 4 Slots to connect to 1,2 or 4 PRI lines. Some PRI Cards come with echo cancellation modules (at extra cost) in order to reduce the echo generated when Digital Signals are converted to IP & vice versa.Explore
An Analog Interface Card is used to connect Analog Trunk lines and/or Analog Extensions (Analog Phones) to the IP PBX/ IP Telephony Server.
There are two types of Analog Interface Cards – Analog Trunk Cards & Analog Extension Cards. The Analog Interface cards are similar to PRI Cards and connect to the PCI Interface of a Server. Of course, they are applicable for a Soft-Switch (Software based PBX) run on a generic Server.
There are Certain Hybrid Cards that have various combinations of Analog Trunk ports & Analog Extension Ports. For example, an 8-Port Hybrid card may contain 4 Analog trunk ports and 4 Analog extension ports (or) any other combination.Explore
A network device that converts voice and fax calls, in real time, between the public switched telephone network (PSTN) and an IP network. The primary functions of a VoIP gateway include voice and fax compression/decompression, packetization, call routing, and control signaling. Additional features may include interfaces to external controllers, such as Gatekeepers or Softswitches, billing systems, and network management systems
There are various category for VOIP Gateways :
Access Gateways , Trunk Gateways , GSM/CDMA Gateways and UC Gateways.
A VoIP phones utilize packet-switched Voice over Internet Protocol (VoIP), or Internet telephony, to transmit telephone calls over the Internet as opposed to the circuit-switched telephony used by the traditional Public Switched Telephone Network (PSTN). The advantage to VoIP phone calls is that unlike regular long-distance calls, phone calls made through a VoIP phone service are free – there are no fees beyond the cost of your Internet access.
Also referred to as online phones or Internet phones, a VoIP phone can be a physical telephone with built-in IP technology and an RJ-45 Ethernet connector instead of the RJ-11 phone connector found in standard phones, or it can be a voice-capable computer that uses VoIP hardware such as MagicJack or VoIP software like Skype. This flexibility makes it possible for VoIP phone calls to function as Internet phone-to-phone, Internet phone-to-PC, PC-to-PC or PC-to-phone calls.Explore