Hi Alex,

Glad to see the mention of SIP Outbound in your updated article. Here's another 5+5 cents of mine that might help others in the future.

May be you faced it, may be not, but in the multi-homed scenario that you describe in your article, there may be circumstances under which calls towards the NAT'ed phone will fail mysteriously. Reason being Firewalls of some ISPs or Enterprises that do packet inspection will reject such SIP requests due to presence of private IP addresses in the VIA and Record-Route headers (those of the SIP farm servers).

The solution to overcome this impediment was quite simple and unexpected for me - TLS encrypt your SIP traffic, which renders firewall packet inspection to... a black hole :)

Same technique bypasses whatever 'smart' ALG Router there might be at client's premises.

Cheers,

--Sergiu

On Sat, May 12, 2018 at 2:33 AM, Alex Balashov <abalashov@evaristesys.com> wrote:

Thank you, but the scope is ambitious enough that I think it would make most sense to limit it to Kamailio-native approaches only.

On May 12, 2018 8:31:58 AM GMT+02:00, Mojtaba <mespio@gmail.com> wrote:
>Hi,
>That's greats concept in this regards.
>I think it could be great to describe about SEMS (e.g B2BUA,
>NAT-Traversal) and working it with Kamailio.
>The SEMS has proper modules to solve NAT Traversal in Kamailio,too
>If you want, I could give you it's documents.
>Thanks With Regards.Mojtaba
>
>On Fri, May 11, 2018 at 6:43 PM, Alex Balashov
><abalashov@evaristesys.com> wrote:
>> Hi,
>>
>> I have updated this article with some other topics:
>>
>>
>http://blog.csrpswitch.com/server-side-nat-traversal-with-kamailio-the-definitive-guide/
>>
>> "The definitive guide" is of course an ambitious and moving target,
>so
>> there may be more evolution in the future.
>>
>> -- Alex
>>
>> --
>> Alex Balashov | Principal | Evariste Systems LLC
>>
>> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
>> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
>>
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>
>
>
>--
>--Mojtaba Esfandiari.S
>
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-- Alex

--
Sent via mobile, please forgive typos and brevity.

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