we just upgraded from 10 PBX phone systems to ONE IP phone system which will save us tons of money and the $550,000 price of the system will pay for itself in less than two years. It is a dream. No more messing with 10 disparate phone/voicemail systems. Just one IP phone server and one voicemail server, thats it (plus the secondaries for redundancy of course). We went with 100% cisco, pricey but worth it.
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by: grbladesPosted on 2006-11-10 at 02:13:41ID: 17913033
Personally I would go for a voip capable PBX and use standard E1/T1 lines out of the office for the phone calls. You get a more reliable connection that way and you dont have any issues with QOS.
That is basically what I did. We have an Asterisk server onsite and 40 GXP-2000 phones but external calls are sent over a E1 30 channel line. We have a dedicated 512K SDSL line also so that people traveling abroad can use a software voip client to connect to our PBX.
Bear in mind that if you are also going to send data over the internet connection then you will need QOS support on the router.