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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.
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Get what you pay for
When I first got it, the box had problems recognizing standard bellcore callerid. After a week of emailing tech support they released a new firmware that fixed the problem. I still have problems making outbound calls, every 3rd or 4th call does not complete.
Easy setup, good voice quality, terrible QoS
The voice quality is very good with no echo. The QoS does not work. The uplink and downlink bandwidth settings seem to be reversed and setting the bandwidth to 10M slows the WAN to about 2M, and don't even try anything lower it is unusable. On top of that it does not even prioritize the voice traffic.
Having to reboot for changes to take affect is also a pain.