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Do I need any Digium inteface card installed on my PC if I want to communicate from one SIP to another SIP using AsteriskNow?
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Do my PC need to have static IP or I can use machine in company LAN?
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Asterisk doesn’t require one, although there are some constraints on kernel version/other hardware for full capability. For AsteriskNow, you need to ask on the AsteriskNow forum.
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Asterisk requires stable addresses, but they don’t have to be public. Accessing outside the LAN, with network address translation, will require careful configuration of the router, and possibly a SIP aware router. In particular, the router must know to which machine to forward RTP packets. AsteriskNow may have additional limitations.