[asterisk-users] Sending calls from behind NAT

[Leighton Brennan]

It looks like you need to enable the sip application layer gateway or ALG on your router. The problem is not exactly a Nat issue. The problem is most likely with the sip header keeping the private IP address, the ALG when enabled will change this to your public 

On 13 Nov 2012, at 21:17, "bilal ghayyad" <bilmar_gh at yahoo.com> wrote:

> Dears;
> 
> It seems my service provider is requesting a complicated settings to allow me to send from behind NAT. 
> 
> What they said:
> 
> "It shouldn't matter as long as you are handling the NAT correctly your end. We do not fix NAT so if you're sending internal addresses in your INVITEs or SDP then things will fail but if you're handling it correctly, we shouldn't tell the difference".
> 
> 
> Really, I did not understand what exactly they need. But maybe what they need is to see my public IP address without the private IP address (this what I understood if I am right).
> 
> I tried to use the following in the [general] settings in the sip.conf
> 
> localnet=192.168.10.2/255.255.255.254
> externadd =196.40.164.239
> 
> But even, the calls are drop .. so what I have to do?
> 
> The following what I get when I enabled the sip debug:
> 
> 
> <--- SIP read from UDP:194.0.220.220:5060 --->
> SIP/2.0 403 UA behind NAT not accepted here
> Via: SIP/2.0/UDP 192.168.10.2:5060;branch=z9hG4bK123c8781;rport=5060;received=196.40.164.239
> From: "asterisk" <sip:gwbilalkwpbx at 192.168.10.2>;tag=as45d7c63b
> To: <sip:9617565116 at outbound.exxs.com:5060>;tag=84f31a80f7bc633204d0bd8d76e9cb24.53a5
> Call-ID: 6f68f414109ba1ff596726c74a0cb5ac at 192.168.10.2:5060
> CSeq: 102 INVITE
> P-Behind-NAT: source
> Server: Service Provider Global Proxy v2
> Content-Length: 0
> 
> So what could resolve my problem?
> 
> Regards
> Bilal
> 
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