Re: [tlug] VoIP help

[Kalin KOZHUHAROV <me.kalin@example.com>]

On Wed, Oct 18, 2017 at 10:18 AM, Jens John <lists@example.com> wrote:
> On Wed, Oct 18, 2017 at 04:06:27AM +0200, Kalin KOZHUHAROV wrote:
>> Since changing provider is kind of impossible, I am left with 3 options:
>> 1. Find a device that will replace the FritzBox, say up to EUR300
>> 2. Add some kind of gateway/proxy that will register the FritzBox and
>> transparently pass all calls to and from provider and can run on cheap
>> hardware
>> 3. Add inline "packet injector" to return "200 OK" to any REGISTER messages
>>
>> For 2, what kind of software do I need? I guess asterisk can be
>> configured in such a way, though I couldn't find similar deployment
>> setup.
>
> kamailio → https://www.kamailio.org. It's just a SIP server, unlike
> Asterisk, which is a SIP AND multimedia server, and will run on low-end
> hardware (Raspberry PI, or any commodity server). It would act as a SIP
> proxy between your Fritzbox and the provider but RTP will need to flow
> around it.
>
Aha! Good hit, I saw it in the OpenWRT packages, but quick look at the
documentation didn't explain that point (or I missed it).

I'll try that. Do you have direct experience with it?

>   Trunk <SIP> kamailio <SIP> Fritzbox
>   |                                |
>   |                                |
>   +------------<RTP>---------------+
>
> You would probably need to forward the SIP ports through the Fritzbox to
> kamailio and use a NATed configuration, unless you have multiple public
> IPs. All in all, what you want should be doable using this setup.
>
I have one or two public IPs "in reserve", so this should not be a problem.

Kalin.