Wednesday, 21 September 2011 00:00

What is VoIP Gateways

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A VoIP Gateway, or Voice over IP Gateway, is a network device which helps to convert voice and fax calls, in real time, between an IP network and Public Switched Telephone Network (PSTN). It is a high performance gateway designed for Voice over IP applications. Typically, a VoIP gateway comes with the ability to support at least two T1/E1 digital channels. Most VoIP gateways feature at least one Ethernet and telephone port. Controlling a gateway can be done with the help of the various protocols like MGCP, SIP;

Benefits of  VoIP Gateways
The main advantage of VoIP gateway is that it can provide connection with your existing telephone and fax machines through the traditional telephone networks, PBXs, and key systems. This makes the process of making calls over the IP network familiar to VoIP customers.

VoIP gateways can end a call from the telephone and can provide user admission control using IVR (Interactive Voice Response) system and provide accounting records for the call. Gateways also help direct outbound calls to a specific destination, or can end the call from another gateway and send the call to the PSTN.

VoIP gateways plays a major role in enhancing carrier services and also supports the simplicity of the telephone calls for less cost and easy access. Flexible call integration has been developed at less cost which enables programmable call progress tones and distinctive ring tones

Functions of  VoIP Gateways
The main functions of VoIP gateways include voice and fax compression or decompression, control signaling, call routing, and packetization. VoIP gateways are also power packed with additional features such as interfaces to external controllers like Gatekeepers or Softswitches, network management systems, and billing systems

Protocol for VoIP Gateways: SIP, H.323, and MGCP is the popular protocol; and signalling for analog VoIP Gateways is loopstart,DDI, E&M; For digital trunk gateway is ISDN PRI, SS7, and R2;

Analog VoIP Gateways with FXS to connects with telephones or PABX, and FXO ports to Co lines from PSTN or PABX; Digital trunk VoIP Gateways with E1/T1 ports to connects with PSTN or PABX; Analog and digital VoIP Gateways with Ethernet port to connect with IP network;

Read 4464 times Last modified on Friday, 23 September 2011 09:41