[asterisk-dev] chan_sip SIP Authentication

[Philipp Kempgen]

Johansson Olle E schrieb:
> The problem arises since you use phone numbers as identifiers for the  
> users. This is not a good thing (TM) and should be avoided. The  
> dialplan is where you route phone numbers. Devices

Or users ...

> should have device  
> names that you address in the dialplan on the extension that is  
> supposed to connect to one or several devices.

While that is very clear in traditional telephony it's not in
VoIP. SIP URI are by no means limited to numeric usernames
(/extensions).

So what would you recommend as the proper SIP way:

123 => {
	Dial(SIP/mac-00-04-13-00-00-01-line-1);
}
Isn't it the SIP registrar and also the network stack that
should figure out where that SIP user/device actually lives?

philipp => {
	Dial(SIP/philipp);
}
There's no need for numeric extensions in SIP (and Jabber for that
matter).

123 => {
	Dial(SIP/philipp);
}
This is what you'd prefer I think.

Unfortunately Asterisk does not support multiple SIP registrations
(resources in Jabber terms).

So what would be the proper way to implement something like
the following in Asterisk:
alias => {
	Dial(XMPP/philipp);
	# dials
	# XMPP/philipp/work and
	# XMPP/philipp/home
	# according to my personal preference
}

Or should the dialplan contain (via an AGI script for example)
my personal preference provided it's my home PBX:
alias => {
	AGI(figure-out-how-philipp-wants-to-be-called.agi);
	Dial(XMPP/philipp/work);
	Dial(XMPP/philipp/home);
	# resp.
	Dial(XMPP/philipp/work&XMPP/philipp/home);
}

> If we go ahead and change matching order, I'm afraid it will break  
> backwards compatibility and stop many systems from working properly.  
> We don't want that.

Definitely not. But as long as it's configurable and off by default
it doesn't break backwards compatibility.


   Philipp Kempgen

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