Draytek Vigor 2820 - Calling Scenario for Voip Function; Calling Via SIP Sever

Vigor2820 Series User’s Guide
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You can just set the settings wrapped inside the red rectangles to fit the request of NAT
usage.
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Example 1: Both John and David have SIP Addresses from different service providers.
John’s SIP URL: 1234@draytel.org, David’s SIP URL: 4321@iptel.org