[asterisk-users] NAT and externip problem or bug

Guido Hecken guido.hecken at gwsnettech.de
Sat Jul 22 02:34:18 MST 2006


posting the relevant parts of your config (sip.conf, extensions.conf) could
help to solve your problem. 

Guido 
 
> I've recently got asterisk running on it's own pc inside my firwewall.
> Mostly it's working fine, but there is one silly problem I can't figure
out.
> (For reference, Asterisk is the latest stable version as of last weekend
> 14th July. All connectivity is SIP or IAX).
> 
> I initially had 'externip' set to my public IP. I have the appropriate
5000
> range ports forwarded to the asterisk PC and external calls seem OK.
> 
> The 'local' phones are a mixture of Sipura boxes and softphones.
> 
> Problem:
> No or one-way audio in internal calls.
> 
> Reason: Asterisk appears to be using the 'externip' address for all SIP
> devices, regardless of their NAT setting.
> Once a call starts, some softphones change the address they are responding
> to & use the external IP rather than the asterisk PCs local IP on the same
> subnet...
> 
> I have tried all NAT options and spent quite a while reading everything I
> can find about sip.conf, but I can't so far find any way of changing this
> behaviour.
> 
> All the internal phones work fine if I comment out the externip line, but
> then the connections outside the firewall are likely to have problems.
> 
> Is there any way of configuring externip on a per-device basis, or should
it
> only have effect on NATed devices?



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