On 10 Apr 2015, at 09:23, Marek Moravcik <marekmorav...@imafex.sk> wrote:

> Hello,
> 
> I'd like to authenticate Kamailio users in LDAP. But it looks like
> Kamailio need to download password from LDAP and authenticate
> user on it's own. Is there any possibility to send password to LDAP
> and let LDAP to say, if the user can be sign in?

For MD5 Digest challenge-response authentication the cleartext password is 
needed.
We do not get any cleartext password from the client, so the SIP auth server
needs to calculate a hash based on the nonce (the challenge), the authentication
realm and the secret. This hash is compared with the hash we get from the 
client.

This is a good reason to run LDAP over TLS.

/O
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