[AusNOG] Fixed wireless fun and games with SIP

[Rob Thomas]

> wrong handset rings and can't take inbound calls.

Welcome to SIP Natpocolypse.

This - specifically the wrong handset ringing - is caused because the
router you are using is forgetting which phone is mapped to which
port.

The super simple easy way to fix this is to give every phone a unique
SIP port - for example, if you have extensions 300, 301 and 302, go
into the phone configuration interface and set their LOCAL SIP PORT to
be '5300' or 5301, or 5302, etc.

That is normally enough to make your router NOT fiddle with SIP
traffic and try to remap it.

If you have any further dramas, feel free to contact me off list (I'm
the guy that wrote FreePBX 8-))

--Rob

On Fri, 1 Mar 2019 at 12:15, Narelle Clark <narellec at gmail.com> wrote:
>
>
> Hi all
> Wondering if anyone has seen this before: customer has home office, SIP phone on dsl and all works fine.
>
> Relocates to another home connected via NBN fixed wireless and shares with another user but wrong handset rings and can't take inbound calls. No apparent issues with video downloads. Makes outbound calls fine.
>
> Looks like NAT getting its ports crossed?
>
> Ideas anyone?
>
>
> Cheers
>
>
> Narelle
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