[Asterisk-Users] Multiple Realm Definitions?

[Olle E Johansson]

S McGowan wrote:
> Hate to keep asking, but I've not been able to find it covered online or in
> docs. 
> 
> I know you can define multiple domains in the sip.conf, but can you define
> multiple realms?
> 
> For instance, I use a central server that handles a couple of area codes, and I
> would like to be able to have authentication realms such as
> <areacode>.hostname.domain.
> 
> Anyone?
> 
No you can't, but it's a good input for the new chan_sip3 :-)

For those of you that don't know what an authentication realm is:

A userID and password is valid within a HTTP auth realm. (SIP uses HTTP 
digest authentication). A realm can cover one to several servers, but if 
it covers several servers all servers has to be able to authenticate all 
users within the realm.

The realm ID is a string that has to be globally unique and therefore 
the recommendation is to use the DNS host name if the realm covers only 
one server or a domain if it covers multiple servers.

In Asterisk, you can set *one* realm in sip.conf for your Asterisk PBX.
By default this is "asterisk" which if you use it can't be considered as 
globally unique ;-)

You can also define authentications for outbound calls based on realms,
teaching Asterisk how to authenticate in various domains if challenged.

/O