Hello,

you do not need a second kamailio, the same instance can listen on
multiple sockets. You can also use a single ip, just listen on one port
for traffic from local network and on another port for external traffic
(this socket with advertise address).

If the router cannot handle dns query based on local traffic, most
devices support so called outbound proxy address, you can set that to
the sip server address with ip.

Cheers,
Daniel

On 05.12.18 13:02, Kjeld Flarup wrote:
> That might work, provided that the router can handle a local DNS.
>
> It would, however still require adding an extra Kamailio instance with
> another IP. Plus a branch of the invite to both local and public
> instance. Plus an extra location table.
>
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>
> On 12/5/18 12:11 PM, Daniel Tryba wrote:
>> On Wed, Dec 05, 2018 at 09:40:38AM +0100, Kjeld Flarup wrote:
>>> Yes, the Phones may be on either local LAN (Wifi) and Internet via
>>> mobile
>>> data.
>> How about use different local address, 1 with an advertise for external
>> clients, 1 without. Have local DNS resolv to the 1 ip without advertise.
>>
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