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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. &nbsp;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? &nbsp;The data center has E1, J1, T1 all available<br />
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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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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? 

digi cards and VOIP Asterisk system?

IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN). Using the Internet, calls travel as packets of data on shared lines, avoiding the tolls of the PSTN. The challenge in IP telephony is to deliver the voice, fax, or video packets in a dependable flow to the user.

IP Telephony

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN).  Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).