[OpenSIPS-Users] PBX sending calls to Opensips

[Schneur Rosenberg]

I'm using opensips as a registrar server and as a loadbalancer, all
phones are registered to opensips and all incoming and outgoing calls
go to Asterisk boxes via load balancing, therefore I have 3 kinds of
calls going to opensips,
1) outgoing calls coming from one of the phones Registered to opensips,
2) incoming calls (we allow all incoming calls no matter from where
they come, I call them unauthenticated DID)
3) Calls ringing to a phone registered to opensips, the Asterisk boxes
will send the calls to the phone either after getting a call from a
DID, or when a internal user wants to call another internal user

The way I differentiate between the calls is  I do a      if
(!(method=="REGISTER") && is_from_local()) this will check credentials
and send call to asterisk to process outgoing call, then I do a  else
if ((method=="INVITE"))  which will check if the call is going to a
local phone by doing  if (!lookup("location", "m")) if that fails that
it assumes its a incoming did call, and it will send it to asterisk
with a prefix so asterisk knows its a unauthenticated incoming call,
bellow I pasted a skeleton of the code I'm using.

Everything worked fine, until I connected a PBX to my opensips, then
the from came in with the address of the PBX and the  is_from_local()
test was not true, so it did not work, I had the same problem when
sending a call from a SPA3000 and blocking caller id, in that case it
also obscured the from address, as follows "From: Anonymous
<sip:anonymous at localhost>;tag=ea3ee097cd947aeeo0." , the only
reference of the user or domain was in the RPID field  and calls did
not go through.

Is there anyway to check if a source IP is registered to our system
and only then it should send a 407? this way if I have a BPX
registered it will then ask for credentials, all others it will assume
that either a call to the local phone or unauthenticated DID, I
understand that I wont be able to send calls to the system only if
registration was done before, but I have no problem with that,  I
could do it with avp_db_query() on the subscriber table, but I want to
know if there is a better way.

If there is there a better solution then the above solution please let me know

        if (!(method=="REGISTER") && is_from_local())
        {
               #check credentials
        }
         else if ((method=="INVITE"))   #unathenticated did or call
going to phone registered to opensips
        {

                if (!lookup("location", "m"))   #calling local phone
                {
                         #send to phone registered to opensips
                }
                else
                {
                         #incoming did send call to asterisk to process
                }
        }
        else
        {
               #outgoing calls route continues here
        }
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