16 Mar
2011
16 Mar
'11
10:09 p.m.
I am attempting to put together code which will allow us to redirect a
call to a different tn if the route failed.
Example:
User dials 11235551234
Kamailio uses LCR to route to 192.168.0.100 (404 error)
Change $rU to 11235550000 in failure_route
The only way I can get $rU to show up in the SIP message is to call
append_branch() which is not a solution because I now end up with two
SIP messages one that is correct and one that is incorrect.
Here is the failure_route I am using. Any input would be appreciated.
failure_route[ECRC] {
if (t_is_canceled()) {
xlog("L_INFO", "Call has been canceled in 'ECRC'.");
exit;
}
xlog("L_INFO", "SIP Response Code: $T_reply_code");
# We should fail over if we received one of these response codes.
if (!t_check_status("[45][0-9][0-9]")) {
xlog("L_INFO", "Not a failover error.");
exit;
}
# Translate the dialed number into the ECRC DID.
dp_translate("1", "$rU/$rU");
# Load the gateways for normal dialing.
xlog("L_INFO", "Trying to find LCR route for $rU");
if (! load_gws("1", "$rU")) {
xlog("Unable to load routing");
t_reply("503", "Unable to load routing");
exit;
}
xlog("L_INFO", "Trying gateway '$avp(i:709)'");
if (!next_gw()) {
xlog("L_INFO", "No LCR route for $rU");
t_reply("404", "No available gateways");
exit;
}
$rd=$dd;
$rp=$dp;
$du=$ru;
xlog("L_INFO", "ru: $ru");
xlog("L_INFO", "du: $du");
#at this point $ru and $du contain the correct uri.
append_branch();
# Send out the request.
xlog("L_INFO", "Now we're sending the request out.");
if (!t_relay()) {
xlog("L_INFO" "Relay failed!");
t_reply("502", "Bad Gateway");
exit;
}
}
Now I have two SIP messages one containing the correct phone number:
INVITE sip:11235550000@xxx.xxx.xxx.xxx SIP/2.0
Record-Route: <sip:xxx.xxx.xxx.xxx;lr=on>
Via: SIP/2.0/UDP xxx.xxx.xxx.xxx;branch=z9hG4bK2e2f.4145be65.2
Via: SIP/2.0/UDP
xxx.xxx.xxx.xxx:5060;branch=z9hG4bK28aa7440;rport=5060
Max-Forwards: 69
From: "Steven Wheeler"
<sip:6124243265@xxx.xxx.xxx.xxx>;tag=as30b3d6f5
To: <sip:11235551234@xxx.xxx.xxx.xxx:5060>
...
And one containing the wrong phone number:
INVITE sip:11235551234@xxx.xxx.xxx.xxx SIP/2.0
Record-Route: <sip:xxx.xxx.xxx.xxx;lr=on>
Via: SIP/2.0/UDP xxx.xxx.xxx.xxx;branch=z9hG4bK2e2f.4145be65.3
Via: SIP/2.0/UDP
xxx.xxx.xxx.xxx:5060;branch=z9hG4bK28aa7440;rport=5060
Max-Forwards: 69
From: "Steven Wheeler"
<sip:6124243265@xxx.xxx.xxx.xxx>;tag=as30b3d6f5
To: <sip:11235551234@xxx.xxx.xxx.xxx:5060>
...
Steven Wheeler
swheeler(a)usinternet.com
952-253-3252