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We recommend forwarding ports UDP/5060 and UDP/10000-20000 for standard FreePBX/Asterisk based installs. It may be possible to get your service working without port forwarding but optimal service will be obtained with the above mentioned ports. You can lock down port UDP/5060 to and for additional security. You can not lock down UDP/10000-20000 to any specific IP address as the media of a phone call can come from hundreds of different IP addresses.