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If you know someone who is into a business that requires extensive voice calling and they still don’t run into exorbitant bills, then probably they are using a VoIP gateway for that purpose. The main use of a VoIP gateway is to bridge the gap between the traditional phone lines and IP networks. The telephone network is connected with the of digital TDM or a Time Division Multiplexing technology that is in contact with that of Internet Protocol Networks that are made to transmit IP packets that comprise of speech in digital form. The role of the VoIP gateway translates the digital voices in the PSTN and local network from both the send and receiving sides. To translate these digital speech packets, a VoIP gateway needs to support many codec’s so that it is able to translate the digital codec’s used by both the LAN and PSTN. Furthermore, the gateway must be capable of converting between various signalling formats. For instance, the PSTN uses two kinds of signalling known as Channel Associated Signalling (CAS) and Common Channel Signalling (CCS). While CAS is usually used on the analogue telephone line that acts as a bridge between the user and exchanging dialling codec by audio tones – a method that is known as Dual Tone Multi Frequency or DTMF. There are other methods also such as pulse dialling where CCS is used for exchanging signalling information. Talking about signalling protocol, the SIP has emerged as the most preferred signalling protocol for VoIP systems and has considerably replaced the tedious ITU signalling protocol H.323. MGCP is also by some VoIP systems to control VoIP gateways. The major advantages of VoIP gateways include the following: • Call routing • Interface for H.323 Gatekeepers, Soft Switches and other such external devices. • Control signalling • Voice and fax compression as well as decompression. • Packetizing voice information (digital). VoIP gateways that are provided by different vendors usually contain the fundamental services of a VoIP gateway and are expected to perform fairly. All you need to do is select the most suitable VoIP gateway for your business needs. It is preferred to take some time and do ample research so as to get a clear idea of what your business needs and how well a particular VoIP gateway may be able to live up to the needs of your business. This is needed because of with time, VoIP gateways too are evolving and thus, deciding on a correct gateway is something that ought to take time and patience. There are gateways available for both small and big business; the big ones need.
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