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Small Business VOIP System

I have been asked to set up a VOIP phone system for a small business. They have two locations. One location with 4 phones and one location with 1 phone. They have a fax machine at each locations as well. I've done a bunch of research, but since I am new to VOIP systems I was unsure if the equpiment I'm looking at supported their needs. SIP trunking is assumed to try and keep cost down. Here are a couple layouts I was looking at:

1)Cisco UC320W - Seems to support everything they need and more, except multi-site SIP trunking. I do not want to go for the more expensive 500 series just for that feature. It has 4 FXO ports which is nice, but aside from fax unecessary if we are using SIP. It also has an FXS port which the fax will use. A bit expensive considering I would need one of these units at each location, unless the second location with one phone can be configured as a remote phone of some kind. I am a little unsure whether the UC320W supports remote IP phones. I also saw one person review it and say that it doesn't support VPN, which concerns me. I may need to buy a router for each location in addition if that is the case.

In the interest of saving them some money, I ran across this:
2)Cisco SPA232D Multi-Line DECT ATA - Supposedly supports up to 5 phones(4 lines), SIP, wireless handsets, all the typical phone functions. It has only one FXO port, and one FXS port for the fax. Honestly I know I'm missing something here because I can't think of anything that this device doesn't cover and yet it presents huge cost savings(as long as they aren't planning on expanding too much). They could easily use this system at the 1-phone location, and if they see themselves growing soon, then the UC320W could be used at the other location.

So my questions are these:Will the SPA232D accommodate a typical 4 workstation business' needs? How about the 1 workstation location? Or do I need to go with the UC320W? Does the UC320W support remote IP phones?

If you need any additional information just ask.
Thanks in advance for the help.
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sharpt
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sharpt
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TechGuaCommented:
Cisco SPA232D:this is a nice end point machine. but in a set up like that you will need your pbx system for your sip trunk. One server to manage trunks and voip connections, voice mail.


Cisco UC320W: this would be the full solution to manage your system and endpoint systems(SPA232D).

 Also PBX servers can do this with a tdm card
http://pbxinaflash.net/

Here would be someone testing their tdm card. with an pbxinaflash setup

http://www.cadvision.com/blanchas/Asterisk/TestingDahdiHW.html
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sharptAuthor Commented:
In looking at what is supported on Cisco's site(forums) I am very disappointed. There are literally no wireless phones that are supported by the UC320W/UC540W. They specifically state that the SPA232D/302D is NOT supported. (Even though the UC320W is supposed to support "ALL SPA300's and SPA500's"). Which leaves a huge gap in their product line. Add to that the UC320W doesn't support VPN or teleworkers, and I'm looking for a different solution.
   The Grandstream GXE5024 IP PBX is very attractive. It supports all the same features as well as VPN, teleworkers, and at almost half the price. Coupled with the Grandstream DP715/DP710's, which appear to be the equivalent of the SPA232D/302D's, also at a much smaller price and I think I may have a solution.
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sharptAuthor Commented:
So here's the basic setup in diagram form(see attached, saved with https://www.draw.io/) using the Grandstream IP PBX and DECT wireless phones as well as a basic router that supports the needed VPN, QoS. Does this make sense? We'll be using SIP trunks via Internet, no PSTN or PRI.
Grandstream.xml
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TechGuaCommented:
this setup should work provided you know how to configure each part.
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