# VoIP
GATEWAY

A VoIP gateway (or PSTN Gateway) is a device which converts telephony traffic into IP for transmission over a data network.

They are used in two ways:

1. To Convert Incoming PSTN / Telephone Lines to VoIP/SIP: The VoIP gateway allows calls to be received and placed on the regular telephony network. In many business cases, it is preferable to continue to use traditional phone lines because one can guarantee a higher call quality and availability.

2. To Connect a Traditional PBX / Phone System to the IP Network: The VoIP gateway allows calls to be made via VoIP. Calls can then be placed via a VoIP service provider, or in the case of a company with multiple offices, interoffice calling costs can be reduced by routing the calls via the Internet. VoIP gateways are available as external units or as PCI cards. The vast majority of devices are external units. A VoIP gateway has a connector for the IP network and one or more ports to connect the phone lines to it.

## Gateway models

### GSM Gateway

VoIP GSM gateway providing GSM network connectivity for softswitch and IP PBX. It supports communication: VoIP to GSM and GSM to VoIP. Thus the calls costs could be significantly reduced by VoIP or GSM network.

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### FXO Gateway

FXO VoIP gateway that connects analog telephone lines or PABX extension interface to VoIP networks. It is a cost-effective and reliable solution for office-to-office voice connectivity.

Fully compliant with SIP and IAX2 Flexible calling rules Superb voice compression with industry standard codecs Line echo cancellation for 8, 16, 32, 64 or 128 ms echo delays Tested and certified with Elastix, BroadSoft, and others

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### PRI Gateway

A VoIP PRI Gateway enables direct routing of calls between the fixed line ISDN and the cost-effective IP networks for capitalizing on low cost VoIP telephony. By integrating a VoIP PRI Gateway with existing PBX / PABX telephone systems, businesses of all sizes can benefit from low-cost Voice over IP calls and achieve substantial cost savings without the high upfront costs associated with communications infrastructure changes related with the migration to VoIP . Add up to 24 (T1) or 30 (E1) crystal clear digital calls to your Asterisk system with a Digium single span digital telephony card. Available in PCI or PCI Express form factor, the single span cards use state of the art technology for unsurpassed call quality and system compatibility..

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### FXS Gateway

FXS VOIP Analog Gateways FXS Aanlog gateways used to connect the Analog Phones, Fax, Dial pad & Headsets and Telephones with IP PBX Systems. You can Use Voip Services thru FXS gateways also. If You have installed IP Telehony Communication/VoIP/IP-PBX/Systems it not necessary you can buy New VoIP Phones you can use you tranditional analog phones, fax machine with the help of FXS VoIP Analog gateways. This can reduce your cost of voip system

Fully compliant with SIP and IAX2 Flexible calling rules Superb voice compression with industry standard codecs Line echo cancellation for 8, 16, 32, 64 or 128 ms echo delays Tested and certified with Elastix, BroadSoft, and others

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