VoIP-gateways from the US manufacturer Cisco are one of the most popular in the transition from traditional telephony to IP-phones in the office. Users note the stable operation of devices of this brand.
The Cisco product range includes both analog and digital gateways. The former have FXS ports, through which the equipment can be connected to standard telephones. Many businesses prefer analog gateways, and thereby save the budget.
To date, the most popular among users is SPA112-XU cisco voip gateway. It is compact and, at the same time, allows you to connect directly 2 analog phones. This is a good solution for small offices and home use. The Cisco 2fxs gateway can be connected to fax machines. The device has a built-in web-based interface, which you can use to set up the equipment.
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However, if you plan to use Cisco equipment for the organization of VoIP telephony, you need to know about some nuances. There are models of gateways from this manufacturer, which run via H.323 protocol. When buying such devices you need to ensure their compatibility with the rest of the equipment on your VoIP network, and most importantly with an IP PBX. If you are using a software PBX, compatibility issue can be solved easily. For example, Asterisk supports the H.323 protocol by means of several modules:
- chan_h323.so (it comes with the Asterisk PBX).
- chan_oh323.so (available as free add-on software to PBXs).
- chan_ooh323.so (available only in the Asterisk-addons package).
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To avoid compatibility issues, it is better to acquire gateways using a common SIP protocol.
According to user feedback, the Cisco VoIP gateways provide a really good voice quality, despite the fact that the t VoIP system has analog lines. This is achieved thanks to the echo cancellation functions implemented in software. The manufacturer has provided the possibility of connecting the echo canceller in the gateways using Cisco IOS software.
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