[OpenSIPS-Users] nathelper and mid_register

[Liviu Chircu]

For that to work, you should do fix_nated_register() instead of 
fix_nated_contact(), while switching mid_registrar to "insertion_mode = 1".

Liviu Chircu
OpenSIPS Developer
http://www.opensips-solutions.com

On 27.10.2017 17:23, Jim DeVito wrote:
> HI Liviu,
> I am trying to deal with NAT while OpenSIPS is acting as the 
> mid-register. The problem is that unless I use fix_nated_contact() 
> mid_register saves the private IP address in the location "table" so 
> when an INVITE comes from the main registrar OpenSIPS is unable to 
> route it. Still trying to figure out how to make that work.
> Thanks!!
>
> On Fri, Oct 27, 2017 at 4:40 AM, Liviu Chircu <liviu at opensips.org 
> <mailto:liviu at opensips.org>> wrote:
>
>     Hi Jim,
>
>     Both functions attempt to rewrite the Contact - the former with
>     SOURCE_IP:SOURCE_PORT, while the latter attempts to do it with
>     ADV_IP:ADV_PORT. Due to the "lazy changes" optimization of the
>     OpenSIPS stack, you cannot serialize these two function calls,
>     rather you are forced to pick one of them.
>
>     Fortunately, there is another way around the above: you can have
>     the mid-registrar insert itself through a Path header, rather than
>     rewriting the Contact to point to its interface. So just switch
>     the mid_registrar to "insertion_mode = 1" and you should be good.
>
>     PS: can you elaborate on what you are trying to achieve? IIRC,
>     fix_nated_contact() should not be called on a REGISTER, rather you
>     should use the fix_nated_register() which forces a ";received="
>     param into the Contact. Conceptually, at least - I'm pretty sure
>     this also won't work well with mid_registrar_save().
>
>     Best regards,
>
>     Liviu Chircu
>     OpenSIPS Developer
>     http://www.opensips-solutions.com <http://www.opensips-solutions.com>
>
>     On 26.10.2017 17:08, Jim DeVito wrote:
>>     Hi All,
>>
>>     So if I call fix_nated_contact(); before mid_registrar_save(); It
>>     will correctly rewrite the Contact URI with the recived IP:PORT
>>     however it mid_register is then not able to append the
>>     contact_match_param to the new Contact URI.
>>
>>     The script looks like this...
>>
>>     if (is_method("REGISTER")) {
>>                     fix_nated_contact();
>>                     mid_registrar_save("location");
>>
>>     It fails with this error.
>>
>>     ERROR:mid_registrar:overwrite_all_contact_hostports: SCRIPT BUG -
>>     second attempt to change URI Contact
>>
>>     ERROR:mid_registrar:mid_reg_req_fwded: failed to overwrite
>>     Contact URI
>>
>>     Thoughts? And Thanks!!
>>
>>     -------------
>>     Jim DeVito
>>
>>
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>
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>
> -- 
> -------------
> Jim DeVito
> Mobile 216.507.9497
>
>
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