Re: [Sipwitch-devel] Sipwitch and csipsimple failure over WAN

[Steve Murphy]

You could be having problems because of lack of router 'hairpinning' . 
There must be a route ( in the router ) between  the local subnet and
the publically forwarded router ports ,   for two clients  to be able to
call each other when sipwitch is outside  ( i.e.  local hosts must be
able to connect to each other by publically forwarded ports ) . You can
find some more discussion of this here:
http://lists.gnu.org/archive/html/sipwitch-devel/2010-08/msg00002.html

If you are using linux and have stun client installed you can find out
if your router supports 'hairpinning' with
stun  stunserver.org

One my network ( using cheapo  linksys routers )  I get

STUN client version 0.96
Primary: Indepndent Mapping, Port Dependent Filter, preserves ports, no
hairpin
Return value is 0x000017

The clue is in 'no hairpin'.

This may or may not be your problem.   Most consumer routers do not
support hairpinning.  They expect machines on local network to connect
to each other on the local network and not by forwarded ports.

If in doubt try and make a call between clients on different subnets  (
maybe you can use a sip client on a mobile device to test this).

If you find this is your problem,  I believe you have ( at least )  2
options.  
a) Get a different router  
b) Run sipwitch on the local subnet AND on a public server.







On 06/16/2014 04:32 PM, address@hidden wrote:
>> Again if there is more we can do to make sipwitch easier for others to
>> work with, I would be happy to do that.
> Hi
>
> Hehe just please tell me if I can use Sipwitch on a public IP address from a 
> different public IP subnet or from behind NAT?
> This is all I need to know :-)
> The only configuration which works is when Sipwitch and both handsets are 
> inside the same subnet.
>
>


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