VoIP adapter:
VoIP adapter is a device that changes analog voice signals into digital IP packets for transfer over an IP network. This device also changes digital IP packets in analog voice streams. This standard VoIP adapter connects to analog telephones through an FXS port. Then VoIP adapter connects to the Local Area Network (LAN) through Ethemet cable and an RJ45 port. There are various adapters also mark an FXO port so that you can connect to the PSTN.
FXS and FXO Ports:
It is very essential to understand the FXS and FXO ports. An FXO port is a line that connects you POTS line to a VoIP adapter whereas FXS port is a line where it connects station devices like your PBX or phones to a VoIP adapter.
How does it work?
VoIP adapters functions as a link between as analog station device (desktop telephone), the PSTN and IP network. It depends on where the voice traffic begins from a VoIP adapter will change voice traffic in the appropriate outline for receipt by the destination network.
If the voice traffic is instigating from an analog telephone or the PSTN a VoIP adapter will change the analog voice signal in a digital signal. Then this digital signal is compacted by employing a codec and bust into a series of packets that are transported crossways the IP network with a signal protocol. Or if the voice traffic is instigating from IP network the it will decompress the digital packets in a digital signal then it transferred in an analog signal for delivery by the station device or send across the PSTN.
VoIP adapter protocols and codecs:
It is very important to understand the basics of VoIP protocols and codecs, even if you are not technical, so that your adapter work accurately, it must to make use of a protocol and codec that is very well-matched with your VoIP phone system and service as well. This protocol and codec very beneficial as it helps you to increase or decrease the call quality.
VoIP protocols:
A VoIP protocol verifies how your voice packet is transferred across a network. The most popular VoIP protocols are Session Initiation Protocol (SIP), it is a standards-based protocol which is used and maintained by the huge popular of VoIP phone systems and services. Cisco Skinny Client Control Protocol (CSCCP), it is a proprietary protocol which is used by Cisco’s Call Manager and IP phones. MGCP and H.323, they are similar to each other and they are the elder VoIP you might come across. It is no longer generally use.
Voice codecs:
A voice codec is dependable for the firmness of your voice stream in a digital packet. It also verifies sound quality and bandwidth needed to send the packet. The most popular voice codecs are GSM-13 Kbps, iLBC-15Kbps, G.711-64 Kbps, G.722-48/56/64 Kbps, G.726-16/24/32/40 Kbps, G.728-16Kbps and G.729- 8Kbps.
The types of VoIP adapters
There are mainly three types:
Single FXS, it permits you to connect single telephone and it is announced with either single or double Ethernet ports.
Dual FXS, it permits you to connect up to dual telephone and it announced with either one or two Ethernet ports.
FXO/ FXS, it is a type where it permits you to connect one telephone and a one POTS line. These permutation adapters are normally used to offers fail-over or life-line capabilities.
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Author: Shaina Kaur
Article Source: EzineArticles.com
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