[asterisk-users] problems with natted phones

[Marek Greško]

Ok,

let substitute lan for 192.168.100.235, provider with 192.0.2.1 and
asterisk with 198.51.100.1.

In the working scenario understand that asterisk is not aware of the
providers ip address 192.0.2.1 in the sip protocol, and it should pick
it from the network layer. It is harder to calcutale port, so it
should probably listen for incoming rtp stream? Until then it is just
sending to private address? But I thing it is futile, since it is
known from the sip protocol there is nat involved and thus the packets
are destined to nowhere.

But I still cannot imagine what goes wrong in non working scenario and
how the asterisk reboot (not every one and not sure this is the real
trigger). The sip communication seems identical to me. The provider's
router does not touch SIP now as observed after disabling SIP ALG.

Thanks

Marek

2021-09-04 0:40 GMT+02:00, Antony Stone <Antony.Stone at asterisk.open.source.it>:
> On Saturday 04 September 2021 at 00:34:49, Duncan Turnbull wrote:
>
>> > On 4/09/2021, at 7:53 AM, Marek Greško <mgresko8 at gmail.com> wrote:
>> >
>> > So you suspect something is messing up SIP protocol? Maybe the phone
>> > itself is not working properly. The phone itself is not aware of the
>> > internet address, so is sending lan private address in the sip
>> > protocol.
>>
>> I doubt it’s the phone. You need to check your data again and ideally
>> explain what you mean by the names you have substituted for the ip
>> addresses
>
> My advice (regarding the IP addresses) is:
>
>  - where you have https://tools.ietf.org/html/rfc1918 addresses, leave them
> as
> they are - you're not giving away any sensitive information by telling us
> about your internal addresses which can't be routed over the Internet
>
>  - where you have public addresses and would prefer not to reveal what these
> are, substitute with https://tools.ietf.org/html/rfc5737 addresses instead.
>
>  - always ensure that you substitute address A in the same way each time,
> and
> address B, etc.
>
>
> Antony.
>
> --
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