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Posted by , on August 13, 2005

When sip is behind a NAT do not forget to specify:

in sip.conf

[general]
nat=yes
externip = X.X.X.X
fromdomain = yourdomain.com
localnet = 192.168.X.0/255.255.255.0
qualify=yes

The host specified by externip can be either a fully qualified domain name (FQDN) or an IP address.

For versions of Asterisk pre v1.2, the hostname associated with externip is only looked up when Asterisk startups up or if a ‘sip reload’ is executed.

You should also add qualify=yes (it wasn’t said here before) if You don’t add this line You won’t be able to do or receive any SIP-call from behind NAT

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