[asterisk-users] SIP to SIP calls

[Raj Jain]

On Tue, May 27, 2008 at 11:55 AM, Adrian Marsh
<Adrian.Marsh at ubiquisys.com> wrote:
> 1)       What does the localnet setting in sip.conf actually effect?  Does
> it mean that inbound SIP calls, from outside the LAN get treated differently
> from those on the LAN? Is it just a NATing thing??

The localnet flag tells Asterisk about the private subnet that it is
sitting in. This allows Asterisk to use its own private IP address (as
opposed to NAT's external IP) when communicating with entities that
are also behind the same NAT.

> 2)       The really basic one:  If I wanted to make a really simple SIP to
> SIP call, eg Xlite to Zoiper client to client, would the URI be :
> sip:2001 at 192.168.0.1  on Zoiper?

Normally when both your devices are registered with Asterisk, you
would simply dial the extension number (e.g. 2001) with no SIP-URI
syntax.

> I'm trying to make calls to sip:  ext at serverip,  but I'm not sure if the
> format should be:
>
> ext at serverip  or
>
> sip:ext at serverip  or
>
> sip://ext_to@serverip/ext_from

You should need to dial the extension number only. You typically enter
a SIP-URI (sip:user at host) in your SIP phone when you want to make a
direct call to a SIP entity that is not registered with your local SIP
Registrar.

--
Raj Jain