[Asterisk-Users] IAX2 and asterisk servers linking to each other

[Anton Krall]

When do you use trunk then? 

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Rich Adamson
Sent: Domingo, 13 de Marzo de 2005 07:37 p.m.
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] IAX2 and asterisk servers linking to each
other

> Guys. I have a few IAX2 connectivity questions that maybe somebody can 
> clarify to me:
> 
> I have my * server and another one with a friend. We are both inside 
> nat and doing port forwarding:
> 
> * -> nat -> internet -> nat -> *
> 
> Now, what I dont understand is this, why FWD needs to be configured in 
> iax.conf with a register and a peer and user entries:
> 
> register => user:pw at iax2.fwdnet.net
> 
> [iaxfwd]
> type=user
> context=fwd-incoming
> auth=rsa
> inkeys=freeworlddialup
> 
> [fwd-gw]
> type=peer
> host=iax2.fwdnet.net
> user=user
> secret=pw
> qualify=2000
> disallow=all
> allow=ulaw
> callerid=Anton Krall
> 
> But for connecting 2 * servers you need just this:
> 
> register => user:pw at asteriskhost.com
> 
> [remoteasterisk]
> type=friend
> language=sp
> host=dynamic
> secret=pw
> context=mty-incoming
> disallow=all
> allow=ilbc
> auth=md5
> trunk=no
> qualify=3000
> accountcode=mike
> 
> Why not use a peer and user entries also? And when do you need to use 
> trunking? In this example, trunk=no.. Why?
> 
> Any enlightment on this will be greatly appreciated.

The register statement is primarily intended to let the other end know your
system is available. Options with the statement include the ability to
inform the other end how you want to be contacted (eg, an extension number
they should use when sending a call to you).

The User and Peer context types are primarily used to specify specific
parameters for incoming and outgoing calls. Maybe a bad example, but you
could specify ulaw for outgoing calls and gsm for incoming calls, or
whatever.

You might have an extensions.conf entry that looks something like:
 exten => _6X.,1,Dial(IAX2/rsa-laptop/${EXTEN:1})
where the call is directed to context=rsa-laptop, or,  exten =>
_6X.,1,Dial(IAX2/1.2.3.4/${EXTEN:1})
where the call is directed to a specific IP address and does not reference a
context.

In the first case, the parameters from the context are used. The second case
does not reference a context, therefore default parameter values will be
used (whatever they happen to be).

So, for you and your friend, if both asterisk systems are always on and
available, there really is no value to register. Just use the User and Peer
contexts, and set passwords and security parameters to your needs.


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