Hello,

On 16/09/14 18:37, Vik Killa wrote:
Thanks Daniel,
I want to remove the htable entry after the register goes through, and I also want to check if the htable entry exists later.

I see

sht_rm_value_re("ha=>.*");
this is going to remove all the items from the hash table -- perhaps you don't want to do that.

To remove the entry you added for register once the registration was successful, add reply_route where you check if it is REGISTER and the code is 200, then remove the item using the call id (same key as you used to add the item).

$sht(a=>$ci::dest_server) = $null;

Assigning $null removes the respective item from hash table.


to remove the htable entry but how do i later check if the key exists?

$null can be used to test if key exists or not, like if($sht(a=>x)==$null)

Cheers,
Daniel


Thanks
/V

On Tue, Sep 16, 2014 at 11:52 AM, Daniel-Constantin Mierla <miconda@gmail.com> wrote:
Hello,

if you want to rely on kamailio to memorize where to send the following register, the hash table is the right tool.

Cheers,
Daniel


On 16/09/14 03:37, Vik Killa wrote:
Hello,
I'm learning Kamailio. My ultimate goal is to be able to route SIP messages from User Agents to specific FS boxes.

I'm starting with routing REGISTER messages.
I used app_perl to randomly lookup one of the FS box's IP Address from postgres database, then I stored the IP in avp and then in hash. It seemed like overkill but it was the only way I could keep the FS IP address in memory between the first REGISTER and REGISTER with Auth.

my app_perl script sets the IP as follows:

my $sth = $dbh->prepare("SELECT ip_address FROM host_machine WHERE is_online = true ORDER BY random() LIMIT 1");
$sth->execute();
my $host_ip_address = $sth->fetchrow();
Kamailio::AVP::add(10, "sip:$host_ip_address:5060");

And here is my kamailio.cfg for REGISTERs

route[REGISTRAR]
{

if (!is_method("REGISTER|PUBLISH"))
return;

if (is_present_hf("Authorization")) {
add_path_received();
$avp(i:10) = $sht(a=>$ci::dest_server);
avp_pushto("$du", "$avp(i:10)");
} else {
perl_exec("random_server");
avp_pushto("$du", "$avp(i:10)");
$sht(a=>$ci::dest_server) = $avp(i:10);

}
t_relay();

exit;
}


"random_server" is the perl script to get the FS IP address...
Seems crude but works... 
I'm sure there is probably a more elegant way to do what im trying so any advice and criticism is appreciated, thank you!

/V




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-- 
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Next Kamailio Advanced Trainings 2014 - http://www.asipto.com
Sep 22-25, Berlin, Germany

_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
sr-users@lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users



-- 
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Next Kamailio Advanced Trainings 2014 - http://www.asipto.com
Sep 22-25, Berlin, Germany