26 Feb
2013
26 Feb
'13
4:51 a.m.
Hello,
if you have to deal with multiple asterisk boxes, it is better to use
permissions module to match the IP addresses of asterisk boxes
(eventually mapping them to an ID via the tag value) and dispatcher
module to send the traffic to them.
Cheers,
Daniel
On 2/25/13 9:03 PM, imcdona(a)gmail.com wrote:
Hello,
I've been having some issues with the syntax of Kamailio's config
file. I've been following the turorial here:
http://kb.asipto.com/asterisk:realtime:kamailio-3.3.x-asterisk-10.7.0-astdb
I'd like to setup Kamailio to act as an SBC providing NAT traversal,
and security for multiple asterisk boxes on the inside. Currently
kamailio has two NIC's, one public and one private. All traffic hits
the external interface and is then forwarded to an Asterisk box on the
inside.
I'd like to modify the config from the tutorial above to support
multiple asterisk boxes. Authentication will be done via MySQL and
depending on the user domain, the request get's forwarded to the
proper Asterisk box. Here is what I've got so far:
if (is_method("REGISTER") && from_uri=~.*(a)10.55.55.5
<mailto:.*@10.55.55.5>)
{
if(isflagset(FLT_NATS))
{
setbflag(FLB_NATB);
# uncomment next line to do SIP NAT pinging
## setbflag(FLB_NATSIPPING);
}
if (!save("location"))
sl_reply_error();
route(REGFWD);
exit;
}
else if (is_method("REGISTER") &&
from_uri=~".*asterisk.domain.tld")
{
if(isflagset(FLT_NATS))
{
setbflag(FLB_NATB);
# uncomment next line to do SIP NAT pinging
## setbflag(FLB_NATSIPPING);
}
if (!save("location"))
sl_reply_error();
route(REGFWDCLOUD);
exit;
}
}
Based on the domain I route the SIP message to another route block
which is esentally the same route block as the origional
route[FROMASTERISK] route[TOASTERISK] route[REGFWD]. I beleive there's
an easier way of doing this though. Creating separate route blocks per
asterisk box would mean creating a new route blocks for each asterisk
box. Here's an example:
route[FROMASTERISK] {
if($si==$sel(cfg_get.asterisk.bindip)
&& $sp==$sel(cfg_get.asterisk.bindport))
return 1;
return -1;
# Send to Asterisk
route[TOASTERISK] {
$du = "sip:" + $sel(cfg_get.asterisk.bindip) + ":"
+ $sel(cfg_get.asterisk.bindport);
route(RELAY);
exit;
# Forward REGISTER to Asterisk
route[REGFWD] {
if(!is_method("REGISTER"))
{
return;
}
$var(rip) = $sel(cfg_get.asterisk.bindip);
$uac_req(method)="REGISTER";
$uac_req(ruri)="sip:" + $var(rip) + ":" +
$sel(cfg_get.asterisk.bindport);
$uac_req(furi)="sip:" + $au + "@" + $var(rip);
$uac_req(turi)="sip:" + $au + "@" + $var(rip);
$uac_req(hdrs)="Contact: <sip:" + $au + "@"
+ $sel(cfg_get.kamailio.bindip)
+ ":" +
$sel(cfg_get.kamailio.bindport) + ">\r\n";
if($sel(contact.expires) != $null)
$uac_req(hdrs)= $uac_req(hdrs) + "Expires: " +
$sel(contact.expires) + "\r\n";
else
$uac_req(hdrs)= $uac_req(hdrs) + "Expires: " +
$hdr(Expires) + "\r\n";
uac_req_send();
}
route[FROMCLOUD] {
if($si==$sel(cfg_get.cloud.bindip)
&& $sp==$sel(cfg_get.asterisk.bindport))
return 1;
return -1;
}
route[TOCLOUD] {
$du = "sip:" + $sel(cfg_get.cloud.bindip) + ":"
+ $sel(cfg_get.asterisk.bindport);
route(RELAY);
exit;
}
route[REGFWDCLOUD] {
if(!is_method("REGISTER"))
{
return;
}
$var(rip) = $sel(cfg_get.cloud.bindip);
$uac_req(method)="REGISTER";
$uac_req(ruri)="sip:" + $var(rip) + ":" +
$sel(cfg_get.asterisk.bindport);
$uac_req(furi)="sip:" + $au + "@" + $var(rip);
$uac_req(turi)="sip:" + $au + "@" + $var(rip);
$uac_req(hdrs)="Contact: <sip:" + $au + "@"
+ $sel(cfg_get.kamailio.bindip)
+ ":" +
$sel(cfg_get.kamailio.bindport) + ">\r\n";
if($sel(contact.expires) != $null)
$uac_req(hdrs)= $uac_req(hdrs) + "Expires: " +
$sel(contact.expires) + "\r\n";
else
$uac_req(hdrs)= $uac_req(hdrs) + "Expires: " +
$hdr(Expires) + "\r\n";
uac_req_send();
}
I'm sure their is any easier way of doing this alhthough I'm not sure
how. Can anyone point me in the right direction?
Lastly, is there a way to modify the DBURL string on the fly so based
on the domain for example, I coudl query a different DB for user
credentials?
Thanks!
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