Call establishes, no audio, but only when forwarding to external number - General Help - FreePBX Community Forums
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Port forwarding - Wikipedia
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pfSense port settings for Asterisk FreePBX - Outside Open
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pfSense port settings for Asterisk FreePBX - Outside Open
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port forwarding - Asterisk/FreePBX behind pfSense – no audio in/out - Super User
Pfsense and FreePBX RTP Issues - Business IT/MSP Talk - Lawrence Systems Forums
pfSense port settings for Asterisk FreePBX - Outside Open
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SIP with NAT or Firewalls
Asterisk SIP Trunk Configuration Guide
