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digi cards and VOIP Asterisk system?

We are installing a new VOIP asterisk system and I am a little confused about the DIGI card part. Our server is going to be at the data center which2 is in the republic of panama and the office is about 10 min away. Most of our calls will be to the U.S. but some will be local to panama as well. Right now we have a PSTN 800 number but I think we will get a new VOIP 800.  We are going to use the Cisco 7960G phone (I believe) My question is on the digi card what do I need to look for if any?  The data center has E1, J1, T1 all available

On a side question are we going to be able to choose on the cisco 7960G to dial out on a panama number or U.s. number?
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kode99Commented:
You only need phone interface cards if you are going to be connecting actual phone service to the server directly.  If all your calls are going to be handled through SIP or voip service then normal networking is all that is needed,  no phone interface cards.

You can assign any phone to any line (voip or regular) that connects to the Aserisk system.  Once you have things connected to the Asterisk server you can pretty much program it to work any way you like.  Calls can also be transferred between phone as well.

Here's a link to some specifics on using 79xx series Cisco phones with Asterisk.  They do need to be changed from default settings to work with Asterisk over SIP connections.

http://www.voip-info.org/wiki/view/Asterisk+phone+cisco+79xx


Also the cards you are referring to are Digium cards,

http://www.digium.com/en/index.php

Sangoma also make very good cards for use with Asterisk systems,

http://www.sangoma.com/
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