[SR-Users] kamailio configuration for pass-thru proxy and username rewrite

[Alex Balashov]

Hi Florian,

Kamailio has limited support for this in the form of the reg facility of 
the 'uac' module:

    http://kamailio.org/docs/modules/4.0.x/modules/uac.html#reg-db-url-id

The 'uac' module can register (with authentication) to other gateways on 
your behalf.  However, it's not very flexible.

 From a methodological point of view, this is probably not the best 
thing to do.  Registration and digest authentication is a feature of 
retail-oriented SIP origination/termination providers.  More 
intra-industrial, resale-oriented (we might call them "wholesale") SIP 
trunking providers usually use trusted IP authentication/authorisation 
for endpoints like your proxy, obviating the need for this exercise. 
Registration is a feature associated with consumer-level endpoints 
(handsets, ATAs, etc.) and dynamic IPs (on residential and 
small-business broadband connections).  Many pieces of equipment within 
the industry don't support registration, and/or don't support answering 
digest challenges.

I recommend that you see if your SIP provider supports IP trust AAA and 
incoming routing to you based on static IP destination as well.  If not, 
you might consider reselling a different SIP provider.

-- Alex

On 08/19/2013 05:56 AM, ACW - Florian Schmid wrote:

> Hello,
>
> i am new to kamailio and have some problems creating the configuration.
>
> What we have now:
>
> A SIP-Provider who gives us sip accounts or sip-trunks with username and
> passwords.
> Our customers, where we have to enter the SIP-Provider's userdata.
>
> What we want to have:
> We want to create a sip proxy between the SIP-Provider and our customers.
>
> Our customers should not see the userdata from the SIP-Provider, but the
> customers should get our usernames and passwords.
>
> What the new kamailio server should do:
> Forward the registration and calls to the SIP-Provider's server and
> change our usernames and passwords to the correct usernames from the
> SIP-Provider.
>
> There should be a translation database table where the usernames and
> passwords from us and from the SIP-Provider were stored.
> Every time a phone or asterisk pbx will register or make a call, the
> kamailio server should change the username and password via the
> translation database table.
>
> The database could be a text file or a mysql database.
>
> Is that possible and can someone please help me to manage this?
>


-- 
Alex Balashov - Principal
Evariste Systems LLC
235 E Ponce de Leon Ave
Suite 106
Decatur, GA 30030
United States
Tel: +1-678-954-0670
Web: http://www.evaristesys.com/, http://www.alexbalashov.com/