[SR-Users] Problem with parallel forking

[Daniel-Constantin Mierla]

Hello,

the problem is that lookup(location) is handling only R-URI, so if ruri 
is for user XYZ and that is offline, then will return false.

Since you create many branches with avp_pushto(), other destinations 
added as extra branches will be not attempted because of 
lookup(location) condition.

The best is to relay the call after the avp_pushto(), so you will get 
two branches (or more) coming back via loopback and then you do lookup 
location for each:

if(src_ip!=myself)
{
    if(avp_db_load("$ru/username","$avp(s:fork)"))
    {
      avp_pushto("$ru/username","$avp(s:fork)/g");
      t_relay();
      exit;
    }
}

if(!lookup("location")) ....

Be sure you skip authentication or other checks when the requests comes 
back due to such loop, using if(src_ip==myself) conditions.

Cheers,
Daniel


On 1/21/11 11:10 AM, Daniel Grotti wrote:
> Hi all,
> I'm using kamailio 3.1 and I have some problems with parallel forking.
> I need to implement parallel forking to different users registered on 
> kamailio.
> So, when call arrives with R-URI= sip:003912345678@<IP_server>, I need 
> to fork te call to (for example) 2 users: 1001 and 1001.
>
> To do that, I've created my usr_preferences table like this:
>
> +----+------+------------------+--------+-----------+------+-------+---------------------+
> |/  id | uuid | username 	       | domain | attribute | type | value |/last_modified       |
> +----+------+------------------+--------+-----------+------+-------+---------------------+
> |/   1 |      |/003912345678/      |        | fork      |    0 | 1001  |              |
> /|/   2 |      |/003912345678/      |        | fork      |    0 | 1002  |              |
> /+----+------+------------------+--------+-----------+------+-------+---------------------+
>
> and I've added a code to my kam.cfg like this:
>
> if (is_method("INVITE"))
> {
> 	
> 	xlog("L_INFO", "REQUEST Invite - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n");
>          if(avp_db_load("$ru/username","$avp(s:fork)"))
>          {
>              avp_pushto("$ru/username","$avp(s:fork)/g");
>
>          }
> 	
> 	if(!lookup("location"))
>          {
>
>                  xlog("L_INFO", "Local user offline - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n");
>                  sl_send_reply("404", "User Offline");
>                  exit;
>          }
>          else
>          {
>
>                  xlog("L_INFO", "Local user online - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n");
>                  t_relay();
>          }
>
> }
>
>
> If 1001 and 1002 are registered everything works fine (1001 Ringing 
> and 1002 ringing).
> Ifonly 1001 registered everything works fine (1001 ringing and 1002 is 
> offline.).
>
> But when 1002 is registered and 1001 in offline, kamailio try to call 
> 1001, find that it's offline ( and I get 404 User Offline") but no 
> call to 1002 is attempted.
>
>
>
> What's wrong ?
>
>
>
> Regards,
>
> Daniel
>
>
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
> sr-users at lists.sip-router.org
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-- 
Daniel-Constantin Mierla
Kamailio (OpenSER) Advanced Training
Jan 24-26, 2011, Irvine, CA, USA
http://www.asipto.com

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