[asterisk-dev] [Code Review]: Add a SIP nat=auto setting

[Terry Wilson]

> On Jan. 27, 2012, 9:53 a.m., Kevin Fleming wrote:
> > /trunk/channels/chan_sip.c, lines 16218-16219
> > <https://reviewboard.asterisk.org/r/1698/diff/2/?file=23678#file23678line16218>
> >
> >     If 'we' are behind a NAT? I don't this feature is related to *Asterisk* being behind a NAT at all. Instead of using personal pronouns, it would be best to refer to the entities involved by their proper designations, since that avoids confusion.

nat=auto would be settable via general or via peers, but setting it in general and overriding via peers could open up the possibility of peer discovery.


- Terry


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On Jan. 26, 2012, 8:28 p.m., Terry Wilson wrote:
> 
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> https://reviewboard.asterisk.org/r/1698/
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> 
> (Updated Jan. 26, 2012, 8:28 p.m.)
> 
> 
> Review request for Asterisk Developers.
> 
> 
> Summary
> -------
> 
> First, this patch as originally posted is from JIRA user pedro-garcia. It has been in JIRA for a long while, and has finally come up to be considered. There were some changes that I wanted to made to the original patch, so I tried contacting the author to get them to put the patch on reviewboard, but after a week I got no response. So, I'm putting the original patch up, then will immediately add a review with my changes. Many thanks to pedro-garcia for his contribution.
> 
> From the JIRA issue:
> 
> I have some devices in the following scenario:
> 
> Asterisk server with public IP address
> Mobile devices (clients):
> 
> When in internal network, no NAT between the client and the server
> When in "roaming" (i.e. a Hotel with WiFi), the client is behing a NAT
> When in 3G, operator transparent sip proxy so it looks as no NAT, but does not support symmetric RTP.
> Sometime, the device gets a public IP with no NAT at all.
> No NAT setting available in asterisk works for all these scenarios at the same time, and I can not request the user to activate different accounts depending on its location.
> 
> I have added a new NAT setting (nat=auto) to the current ones. When set, chan_sip auto detects from the Via header, the recv sockaddr, and the rport setting if the client is behind a NAT.
> 
> It also adds to cli interface results (sip show peer/s) info on this (so now you could see "N" for NAT and nothing for no NAT as before, "a" for auto detect no NAT, and "A" for autodetect NAT.
> 
> 
> This addresses bug ASTERISK-17860.
>     https://issues.asterisk.org/jira/browse/ASTERISK-17860
> 
> 
> Diffs
> -----
> 
>   /trunk/channels/chan_sip.c 352610 
>   /trunk/channels/sip/include/sip.h 352610 
>   /trunk/configs/sip.conf.sample 352610 
> 
> Diff: https://reviewboard.asterisk.org/r/1698/diff
> 
> 
> Testing
> -------
> 
> Lots of reloads with changing values, and registry natted and un-natted phones. I also set the nat_supertest in testsuite to run with nat=auto to make sure that it responded the same with existing and non-existing peers.
> 
> 
> Thanks,
> 
> Terry
> 
>

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