nonya
Rated PG
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 Posted: Mon, 17 Jul 2006 23:27:39 Post Subject: |
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Sounds like you could use a high powered Asterisk box and a few T1's. Quad Xeon and a few Gigs of RAM would do it. Out of the 70 people in your office probably only 20 or 30 would be on the phone all at the same time 50 max, so dual dedicated T1's should do the trick. You can get that for around 1k a month. Four POTS line (FXO) connections would be good for fail over in the event of you T1 going down and if its dedicated this is not likely.
Cisco 7940G's are the way to go if you can spend $240+ per phone.
Linksys SPA-942's are the way to go if you need to get in under $180 per phone.
Grandstream GXP-2000's if you need to get in under $100.00 per phone.
A Digium dual or quad T1 card is also a must.
For a business with POTS line (FXO's) failovers 911 is a non issue. Just map your dial plan so all 911 calls use an analog line.
Most people who have trouble with VoIP have not followed one of these 5 sacred rules:
1) Use dedicated circuits to your ITSP
2) Use quality equipment
3) Use QoS
4) Use QoS
5) Use QoS
Just for fun lets do a quick and dirty calculation on how much you would save.
70 people, 120 minutes average phone usage per day for 20 days out of the month.
70 x 120 x 20=168,000 minutes per month. Average cost savings on a VoIP minute versus POTS minute 1.8 cents ($0.04 cents for POTS, $0.022 for VoIP)
168,000 x 0.018 = $3,024 savings per month on minutes alone.
What about per line savings?
48 lines from the phone company would cost you around $2400 per month.
2 T1's (48 lines) would cost you about $1,000 per month + 4 PSTN failovers $200, so $1200 per month in per line savings.
See why VoIP is growing at break neck speed? |
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