[Asterisk-Dev] chan_sip.c : ignoring domain part for incoming INVITE's causes conflicts between domains?

[Bruno Rocha]

Hi!

I've configured two Asterisk 1.2.1 machines: astA.domain.tld and 
astB.domain.tld
astA sip users: mary (mary at astA.domain.tld), john (john at astA.domain.tld)
astB sip users: alice (alice at astB.domain.tld), mary (mary at astB.domain.tld)

All users are behind NAT and using their respective asterisk's as sip 
proxy and outbound proxy. Both asterisk servers have public IP addresses.

When mary at astA.domain.tld makes a call to alice at astB.domain.tld, astA 
receives "407 Proxy Authentication Required".

If I remove the user mary from astB, the call succeeds.

After further investigation I guess the problem is in 'chan_sip.c' 
function 'check_user_full'.
When asterisk receives an INVITE, the 'From' field is used to check if 
the user has a local sip account, but just the username part is used. 
When receiving a call from other domain and a local user exists with the 
same username, authentication is requested, and the call fails.

I've already tried the sip options:

allowguest=yes
allowexternalinvites=yes
autocreatepeer=yes

and the behavior is the same.

Is this a bug, a feature or am I missing some configuration option?

-- 
Bruno Rocha