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Disable SIP ALG and Forward NAT Ports to Stop Dropped Calls

How to open my firewall for VoIP? A VoIP phone system offers your company voice and video calling, presence, business phone system functions, IM, and other communications features. But if your office network is improperly configured, these leading features might not work at all. In fact, internet problems can stop VoIP calls from even taking place. Your office internet connection is likely con...
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