VoIPowering Your Office with Asterisk: Getting SIP through Firewalls, Part 2
IAXed you first
First let's look at something that's a little easier: using IAX trunks. IAX is a more NAT-friendly protocol because it only needs a single port. If you set up IAX trunks between servers, then your SIP traffic will waltz happily through your IAX trunk to your SIP endpoints
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