Asterisk cards have a different number of ports, due to the variety of needs for different applications, manufacturers try to address them. For beginners, one can request for Asterisk card with single port configured with 1 FXO module. At first, you receive the option of accept incoming calls, afterwards you can route them anywhere within your IP network. It’s only in case of a live call, and than your line is busy because you have a single FXO to handle that call.
For a basal setup you will get an Asterisk card with 4 ports, which has 2 FXO and 2 FXS modules. Allowing you to accept 2 incoming calls from 2 different numbers coming from Telco and then they are routed to 2 analog phones, which are connected in FXS or to any number of IP and soft phones within your network. And don’t forger that you need certain amount of FXS modules for certain amount of devices you have (1:1 ratio). Virtually there are no limits for IP phones or soft phones. All that is required is that you make sure they are connected with the Asterisk card in the same network
Once you’re into it, you may purchase an 8 port card. It will expand 4 port support to many modules for applications. For example if you have 4 lines from your Telco and 4 analog phones, buy an 8 port card, 4 FXO modules, 4 FXS modules, and you’re set. The type of card that fits you requirements depends on a number of devices that you'd like to be connected withing your VoIP network.
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