I don't know what you mean by talk.
Cost difference:
well this is how I calculated it, one the overall cost of having to
get an asterisk box that needs more CPU, and 2 the actual cost of the
cards to make it work. As well as taking into considiration that adit
is telco grade equipment, and has very good performance.
Option 1: An adit 600 loaded with 6 FXS cards = $800, Digium Quad t1 = $1500.
Option 2: An adit 600 with 5 FXS cards, and 1 CMG02 card = $1500 (Max,
you could get it for cheaper).
Option 1 for 384 (8 * 48) analog ports: 8 * 800 + 2 * 1500 = $9,400.
(around $24.50 per port)
Option 2 for 360 (9 * 40) analog ports: 9 * 1500 = $13,500. ($37.50 per port)
But option 2 can all go on one asterisk box, since it's all voip, and
no transcoding has to take place (in fact it's like getting 9 more
asterisk boxes to give you some more horsepower). With option 1 you
will run into problems of using more than one digium card on one box,
although it works, it is not recommended. Consider that a dual xeon
system costs $3000 you will end up paying $7,700 for each pair of 4
adit boxes, and this doesn't even give you the options of adding telco
t1s.
In my opinion using the CMG cards will pay out in every single way when you are talking of anything more than 2 Adit boxes to a single system.
Couple observations.
Adit with CMG uses MGCP vs SIP. Not sure how extensive the * support is for this. I believe Carrier Access is working on a SIP release but not sure how complete it will be. CMG/CMG2 are nice cards. Also have a nice license builtin for G729. If you use though you will need a matching one for the * server. However there is also a call limit of 12, I think, for the CMG and 24 for the CMG2 cards. Depending on application you could easily exceed this. So take the 8 T1 capacity with a grain of salt, you will not be able to have that may calls up at a time.
Also one of my favorite applications is connecting an Adit directly via T1 to a Digium card. Then using another T1 port on the Digium card to connect to PRi from PSTN. This is called a traditional TDM switch. No IP in the patch, no headaches. Great for such things as FAX and ALARM circuits which are very problematic with IP in the path.
It is not always about up front costs but about capabilities and support costs down the line.
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