[SR-Users] problem forking to dbaliase

[Daniel-Constantin Mierla]

Hello,

On 12/13/11 2:31 PM, Yufei Tao wrote:
> Hi
>
> I'm using Kamailio 3.1.5 and want to fork calls to all members in the
> same group defined in dbaliase. e.g. alias_username is 'clients' for 3
> usernames: 'clientone', 'clienttwo', 'clientthree'.
>
> If any of the 3 users are online, call to the alias_username 'clients'
> looks fine: INVITE is forked to all online users etc.
>
> But problem comes when none of the users are online: in this case,
> t_relay will cause a server error 500, as server tries to relay to the
> user on trunk, e.g. clientone at domain.com, for which failed to find a
> location entry and uri remaied clientone at domain.com rather than an IP
> address.
>
> I expected server to send a 404 if non of the users for alias_username
> 'clients' is online. How should I fix it please?
500 is caused by doing drop to all branches, so tm creates the 
transaction, but there is no outgoing branch sent to network.

A nice solution for the future will be to add kind of 
t_reply_branch(...) which will set the reply code for the branch. 
t_reply() is working at transaction level.

Right now an option you can do is to set r-uri in branch route to 
something like 'sip:notfound at yourserverip' instead of drop and let the 
branch go out.

$ru = "sip:notfound at yourserverip";

The at the beginning of request route block you can test:

if(src_ip==yourserverip && $rU="notfound") {
  sl_send_reply("404", "not found");
  exit;
}

Cheers,
Daniel

>
> Following is relevant parts from my config file:
>
> #############################################################
> route[LOCATION]
> {
>    if ( alias_db_lookup("dbaliases") )
>    {
>      t_on_branch("BRANCH_ALIASDB"); # in branch_route[BRANCH_ALIASDB],
>                                     # call another route that looks up
> location,
>                                     # if not existent, call drop()
>
>    }
>    else
>    {
>      xlog("L_DBG","LOCATION: not alias - go to lookup location trunk\n");
>      route(LOCATION_TRUNK); # normal look up location and sending of 404 etc
>    }
>
> ... ...
> }
> #############################################################
> branch_route[BRANCH_ALIASDB]
> {
>    xlog("L_DBG", "BRANCH_ALIASDB: $fU@$fd ->  $rU@$rd; Method:$rm\n");
>    route(LOCATION_BRANCH);
> }
>
> route[LOCATION_BRANCH]
> {
>    if (!lookup("location"))
>    {
>      # Drop this branch - it's going nowhere
>      drop();
>    }
> }
> #############################################################
> route[RELAY] {
>    xlog("L_DBG","RELAY: method=$rm, callid=$ci, cseq=$cs\n");
>
>
> #!ifdef WITH_NAT
>    if (check_route_param("nat=yes")) {
>      setbflag(FLB_NATB);
>    }
>    if (isflagset(FLT_NATS) || isbflagset(FLB_NATB)) {
>      xlog("L_DBG", "RELAY: about to call RTPPROXY\n");
>      route(RTPPROXY);
>    }
> #!endif
>
>    /* example how to enable some additional event routes */
>    if (is_method("INVITE")) {
>      t_on_reply("REPLY_ONE");
>      t_on_failure("FAIL_ONE");
>    }
>
>    if (!t_relay()) {
>      sl_reply_error();
>    }
>
>    exit;
> }
>
> #############################################################
> And in the main route, route LOCATION and RELAY are the last two routes:
> route {
> ...
>
>    # user location service
>    route(LOCATION);
>
>    route(RELAY);
> }
>
> Thanks very much!
>
> Yufei
> --
> Yufei Tao
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-- 
Daniel-Constantin Mierla -- http://www.asipto.com
http://linkedin.com/in/miconda -- http://twitter.com/miconda