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IP Office Techs

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A Gateway is a key component in most VoIP phone systems.  It is the device that connects your traditional phone lines to the VoiP system, translating standard analog phone lines into their VoIP counterparts - the SIP trunk line.  A Gateway is also used to allow standard single line analog or cordless phones to be used in a VoIP environment.  Gateways connect to the main phone system VoIP PBX via an Ethernet port to the network.

Gateways are produced in two flavors, the FXS and the FXO.  The FXS is for connecting standard single line analog phone sets, fax machines, legacy conference phones, paging and intercoms while the FXO variety is used to connect your standard AT&T copper lines or cable providers phone lines.  A way to remember is the FXO ends in "O" which denotes an Outside Phone Line and the FXS end in "S" which denotes an Inside Phone Station.

It is noteworthy to mention that there are two other methods of connecting the outside phone lines to a VoIP system.  The most direct method is to connect a VoIP SIP Trunk Line.  This does not require any additional hardware in a VoIP Phone Sytem.  Lastly is the PRI digital phone line, which does require an interface card in the phone system PBX server. The PRI line is typically used in larger (over 20 user) environments and is often used with traditional phone systems. The PRI line can easily migrate to a VoIP system and is as reliable as a dedicated SIP trunk.


Grandstream GXW4004 4 FXS VoIP Gateway

The Grandstream GXW4004 is a 4 FXS port gateway that allows analog phones or fax machines and traditional analog PBX systems to connect to a VoIP system or provider. It features 2 10/100 network ports with an integrated router for connecting to the network and an RJ11 line for PSTN failover.

The Grandstream GXW4004 also supports 2 SIP account profiles, caller ID for various countries/regions, T.38 fax, flexible dialing plans, security protection (SIPS/TLS), and comprehensive voice codecs.

This Grandstream FXS Gateway is an ideal solution for businesses looking to connect one or more lines of a traditional PBX to a VOIP phone system or provider. Each SIP Account supports 2 profiles and the GXW4004 supports T.38 fax along with G.711, G.723, G.726, G.729 and iLBC codecs.



Grandstream GXW4004 Features and Functions

  • 4 FXS ports
  • Two RJ-45 ports 10/100 Mbps (switched or routed)
  • Multiple SIP accounts (choice of 2 profiles per account)
  • T.38 Fax compliant
  • G.168 Echo Cancellation
  • Voice Activation Detection (VAD)
  • Comfort Noise Generation (CNG)
  • Packet Loss Concealment (PLC)
  • Supports PSTN/PBX analog telephone sets or analog trunks


Grandstream GXW4008 8 FXS Port VoIP Gateway

The Grandstream GXW4008 is an 8 FXS port gateway that allows analog phones or fax machines and traditional analog PBX systems to connect to a VoIP system or provider. It features 2 10/100 network ports with an integrated router for connecting to the network and an RJ11 line for PSTN failover. It also has an RS232 serial port for administration.

The Grandstream GXW4008 also supports 2 profiles per SIP Account, caller ID for various countries/regions, T.38 fax, flexible dialing plans, security protection (SIPS/TLS), and comprehensive voice codecs.

The GXW4008 FXS gateway is an ideal solution for businesses looking to connect one or more lines of a traditional PBX to a VOIP phone system or provider. Each SIP Account supports 2 profiles and this FXS Gateway supports T.38 fax along with G.711, G.723, G.726, G.729 and iLBC codecs.


Grandstream GXW4008 Features and Functions

  • 8 FXS ports
  • Two RJ-45 ports 10/100 Mbps (switched or routed)
  • Multiple SIP accounts (choice of 2 profiles per account)
  • T.38 Fax compliant
  • G.168 Echo Cancellation
  • Voice Activation Detection (VAD)
  • Comfort Noise Generation (CNG)
  • Packet Loss Concealment (PLC)
  • Supports PSTN/PBX analog telephone sets or analog trunks



Grandstream GXW4108 8 Port FXO VoIP Gateway (also available in 4 port: GXW4104)


The Grandstream GXW4108 analog FXO gateway allows small businesses and remote locations to seamlessly connect up to 8 PSTN lines to an existing IP PBX System or analog phone system. The GXW4108 features 8 FXO ports allowing up to 8 lines to connect to the PSTN and 2 switched 10/100 Ethernet ports that can be routed to connect to the network. It is T.38 Fax compliant and features G.168 echo cancellation support. The GXW4108 also includes a video surveillance port so you can incorporate Grandstream IP surveillance cameras into your network.

Designed and tested for full interoperability with leading IP-PBXs, soft-switches and SIP-based environments, the Grandstream GXW4108 analog gateway ensures manageability, a simple configuration, superb voice and video quality and feature rich functionality. The Grandstream GXW4108 Analog Gateway series is based on open industry standards.


Grandstream GXW4108 Features and Functions
  • 8 FXO port media gateway
  • Video surveillance port
  • Two RJ-45 ports 10/100 Mbps (switched or routed)
  • External power supply
  • TFTP and HTTP firmware upgrade support
  • Multiple SIP accounts (choice of 3 profiles per account)
  • Programmable PSTN line settings for different countries/regions
  • 1 or 2 stage dialing
  • Caller ID
  • G.168 - echo cancellation
  • Flexible DTMF transmission: In Audio, RFC2833, SIP Info or any combination of the 3
  • Selectable, multiple LBR coders per channel
  • T.38 Fax compliant




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