Hardware requirements for Asterisk IP PBX

Dear Experts, we are setting up an Asterisk IP PBX in an office environment in Ubuntu Server. What do we need to purchase so that internal user can make phone calls to outside and vice-versed?

Many thanks in advance!
DP230Network AdministratorAsked:
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YOu need SIP trunk(s) and at least one telephone number provided by an ITSP.
DP230Network AdministratorAuthor Commented:
can you please clarify and suggest some models?

how can we configure to call to / receive from public telephone number?
If you want to utilize VoIP, then you need a SIP trunk from a company like Appia, Bandwidth.com, Nextiva, or Flowroute. (Note: There are far more companies out there that offer trunks, including Digium) Here is a link to Digium's offerings: https://www.asterisk.org/products/sip-trunk

If you wanted to use traditional copper lines, then you need an analog interface card. Here are some offerings from Digium: https://www.digium.com/products/telephony-cards/analog

how can we configure to call to / receive from public telephone number?
That is part of what you have to configure within Asterisk. You'll need to look at extensions.conf. After you have the SIP Trunk (assuming you're going to VoIP route) set up, then you need to work on each of your DIDs, and where you want them to ring. Here's an article from CallCentric regarding the topic to assist a bit, but I recommend you get the assistance of a professional: https://www.callcentric.com/support/device/did_routing

If you'd rather have something where you don't have to put the software and hardware together yourself, Digium (company behind Asterisk) also makes Switchvox phone systems: https://www.digium.com/products/business-phone-systems

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