asterisk users - Dec 2006 - direct IP calling with extension

All,

If I have video phones behind an asterisk server (with 2 network cards)
and all the phones have extensions. Internally everything works great.

Now for people that want to call my video phones external to my office
is there a way to do that? On the extenal persons phone enter an IP/EXTEN
where IP is my server and not the phone? Can that work?

Would I have to have PUBLIC IP address for every phone NAT'ed through my
server to make the call?

Thanks,

Jerry

Am Freitag, den 01.12.2006, 13:44 -0500 schrieb Jerry
Geis:
> All,
> 
> If I have video phones behind an asterisk server (with 2 network cards)
> and all the phones have extensions. Internally everything works great.
> 
> Now for people that want to call my video phones external to my office
> is there a way to do that? On the extenal persons phone enter an IP/EXTEN
> where IP is my server and not the phone? Can that work?
> 
> Would I have to have PUBLIC IP address for every phone NAT'ed through
my
> server to make the call?
AFAIR, define a "context" in the global section of sip.conf. Any
incoming SIP connections that are not identified to belong to any other
context (registration) will come thru that extensions.conf context.
Inside, just "forward" through to your proper local extensions:

[locals]
exten => 200,1,Dial(SIP/myphone1)
...
[sipfromoutside]
exten => johndoe,1,Goto(locals,200,1)
...

Then direct IP calling as   johndoe@123.45.67.89
should work. To get calling at a hostname working as well, you will need
a few records in your DNS setup.

example.com. IN A 123.45.67.89
sip.example.com. IN A 123.45.67.89
example.com. IN NAPTR 60 50 "s" "SIP+D2U" ""
_sip.udp.example.com.
_sip._udp.example.com. IN SRV 10 10 5060 sip.example.com.

Which will allow for johndoe@example.com
I suspect the first "example.com" line is not necessary (such that you
can host your domain on a different server than that which runs
Asterisk), but I did not test.

HTH
Anselm

>Am Freitag, den 01.12.2006, 13:44 -0500 schrieb Jerry Geis:
>>/ All,
/>>/ 
/>>/ If I have video phones behind an asterisk server (with 2 network
cards)
/>>/ and all the phones have extensions. Internally everything works
great.
/>>/ 
/>>/ Now for people that want to call my video phones external to my
office
/>>/ is there a way to do that? On the extenal persons phone enter an
IP/EXTEN
/>>/ where IP is my server and not the phone? Can that work?
/>>/ 
/>>/ Would I have to have PUBLIC IP address for every phone NAT'ed
through my
/>>/ server to make the call?>
/
>AFAIR, define a "context" in the global section of sip.conf. Any
>incoming SIP connections that are not identified to belong to any other
>context (registration) will come thru that extensions.conf context.
>Inside, just "forward" through to your proper local extensions:
>[locals]
>exten => 200,1,Dial(SIP/myphone1)
>...
>[sipfromoutside]
>exten => johndoe,1,Goto(locals,200,1)
>...
>Then direct IP calling as   johndoe at 123.45.67.89
<http://lists.digium.com/mailman/listinfo/asterisk-users>
>should work. To get calling at a hostname working as well, you will need
>a few records in your DNS setup.
>example.com. IN A 123.45.67.89
>sip.example.com. IN A 123.45.67.89
>example.com. IN NAPTR 60 50 "s" "SIP+D2U" ""
_sip.udp.example.com.
>_sip._udp.example.com. IN SRV 10 10 5060 sip.example.com.
>Which will allow for johndoe at example.com
<http://lists.digium.com/mailman/listinfo/asterisk-users>
>I suspect the first "example.com" line is not necessary (such that
you
>can host your domain on a different server than that which runs
>Asterisk), but I did not test.
>HTH
>Anselm

THanks, this seems to almost get me there... Once I call into the server
and goes to my locals I no longer get Video.

When I call the extension directly I get video no problem.

When I first call the server at my IP address then it routes to my local
I no longer get video.

Any ideas why that might be?

THanks,

Jerry

Am Freitag, den 01.12.2006, 15:27 -0500 schrieb Jerry
Geis:
> >Am Freitag, den 01.12.2006, 13:44 -0500 schrieb Jerry Geis:
> THanks, this seems to almost get me there... Once I call into the server
> and goes to my locals I no longer get Video.
> 
> When I call the extension directly I get video no problem.
> 
> When I first call the server at my IP address then it routes to my local
> I no longer get video.
> 
> Any ideas why that might be?
I suspect that is caused by asterisk not knowing about your video codecs
(I have never done video over IP myself, so just a guess).

If your devices talk to each other,
#   device <=> device
they can use all the codecs both of them know

As soon as asterisk is involved,
#   device <=> asterisk <=> device
the codec negotiation goes through asterisk. So asterisk must at least
_know_ the codec that those devices want to use.

I think I saw some info about that in the www.voip-wiki.org

BR
Anselm