[OpenSIPS-Users] Load balancer and CANCEL requests

[Peter P GMX]

Hello,

I put some additional code to handle the cancel request. Now ist works.
Here is the code I put :
# CANCEL processing
if (is_method("CANCEL")) {
if (t_check_trans())
t_relay();
exit;
}

Best regards
Peter


Peter P GMX schrieb:
> Hello Bogdan,
>
> we only very slightly modified the openser.cfg:
> We only added the
> REGISTER in
> if (!is_method("INVITE") && !is_method("REGISTER")){
> in order to balance resgisters to the Freeswitch cluster.
>
> and added
> # Load Balancing only for my.domain
> if ($td=~"^my.domain") {
> in order to handle outbound requests to other phones through OpenSIPS.
> This is needed to produce our test case when making a call between 2 phones.
>
> While putting in some debugging lines I found out that
> # handle cancel and re-transmissions
> if ( !t_check_trans() ) {
> if (is_method("CANCEL")) {
> is not successful during the cancel request. So !t_check_trans() seems
> to be false in that case as ismethod("CANCEL") is not called.
> Then is continues the script and sends a 405 message.
>
> Howwver the INVITE and CANCEL reequest had the same call-id.
>
> Here's my opensips.conf:
> =========================
> debug=1
> memlog=1
>
> fork=yes
> children=2
> log_stderror=no
> log_facility=LOG_LOCAL0
>
> disable_tcp=yes
> disable_dns_blacklist = yes
>
> auto_aliases=no
>
> check_via=no
> dns=off
> rev_dns=off
>
> listen=udp:xx.xx.xx.xx:5060
> alias=udp:my.domain:5060
>
> mpath="/usr/local/lib64/opensips/modules/"
>
> loadmodule "maxfwd.so"
> loadmodule "sl.so"
> loadmodule "db_mysql.so"
> loadmodule "tm.so"
> loadmodule "xlog.so"
> loadmodule "uri.so"
> loadmodule "rr.so"
> loadmodule "dialog.so"
> loadmodule "mi_fifo.so"
> #loadmodule "mi_xmlrpc.so"
> loadmodule "signaling.so"
> loadmodule "textops.so"
> loadmodule "load_balancer.so"
>
> modparam("mi_fifo", "fifo_name", "/tmp/opensips_fifo")
>
> modparam("dialog", "dlg_flag", 13)
> modparam("dialog", "db_mode", 1)
> modparam("dialog", "db_url", "mysql://user:pass@localhost/opensips")
>
> modparam("rr","enable_double_rr",1)
> modparam("rr","append_fromtag",1)
>
> modparam("load_balancer", "db_url","mysql://user:pass@localhost/opensips")
>
>
> route{
> if (!mf_process_maxfwd_header("3")) {
> sl_send_reply("483","looping");
> exit;
> }
>
>
> if (!has_totag()) {
> # initial request
> record_route();
> } else {
> # sequential request -> obey Route indication
> loose_route();
> t_relay();
> exit;
> }
>
> # handle cancel and re-transmissions
> if ( !t_check_trans() ) {
> if (is_method("CANCEL")) {
> exit;
> }
> }
>
>
> # from now on we have only the initial requests
> if (!is_method("INVITE") && !is_method("REGISTER")){
> send_reply("405","Method Not Allowed");
> exit;
> }
>
> # Load Balancing only for my.domain
> if ($td=~"^my.domain") {
> # detect resources and do balancing
> if ($rU=~"^conference") {
> # looks like a Conference call
> load_balance("1","conf");
> } else if ($rU=~"^voicemail") {
> # looks like a VoiceMail call
> load_balance("1","vm");
> } else {
> # Forward to the freeswitches
> load_balance("1","freeswitch");
> }
>
> # LB function returns negative if no suitable destination (for requested
> resources) is found,
> # or if all destinations are full
> if ($retcode<0) {
> sl_send_reply("500","Service full");
> exit;
> }
>
> xlog("Selected destination is: $du\n");
> }
>
> # send it out for all domains
> if (!t_relay()) {
> sl_reply_error();
> }
> }
>
>
> Bogdan-Andrei Iancu schrieb:
>   
>> Hello Peter,
>>
>> First of all the script from the tutorial does LB only for initial 
>> requests, requests that are creating a dialog (like INVITE). All other 
>> sequential requests (in dialog requests) are routed based on Route 
>> header, directly to the FS where the call was sent.
>>
>> The CANCELs are processed in a stateful way. The CANCELs are matched 
>> against the INVITE transaction and automatically sent to the same 
>> destination where the INVITE was sent. The relevant script part is:
>>
>>         # handle cancel and re-transmissions
>> 	if ( !t_check_trans() ) {
>> 		if (is_method("CANCEL"))
>> 			exit;
>> 	}
>>
>>
>> So, the script does properly handle the CANCELs and there is nothing 
>> else required to make it work.
>>
>> My question is, using the script as per tutorial (no changes of yours), 
>> what happens when OpenSIPS does receive a CANCEL?
>>
>> Regards,
>> Bogdan
>>
>> Peter P GMX wrote:
>>   
>>     
>>> Hello,
>>>
>>> I am using the load balancer in front of a Freeswitch cluster.
>>> Freeswitch is always in the SIP route.
>>> It handles Registers and Invites quite well.
>>>
>>> However CANCEL is not working according to the tutorial in
>>> http://www.opensips.org/index.php?n=Resources.DocsTutLoadbalancing
>>>
>>> CANCEL requests are aborted with 405 Method Not Allowed.
>>> I understand that CANCELS should not be balanced as it cannot be forseen
>>> which Freeswitch will receive this CANCEL request, right? Or does the
>>> load balancer handle this correctly based on a call id?
>>>
>>> So I tried to allow CANCEL in
>>>
>>>  if (!is_method("INVITE") && !is_method("REGISTER")) &&
>>> !is_method("CANCEL")) {
>>> ...
>>>
>>> This leads to "500 Service full", means some error occured.
>>>
>>> Question: How can I handle the CANCEL request correctly?
>>>
>>> Best regards
>>> Peter
>>>
>>>
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.opensips.org
>>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>>
>>>   
>>>     
>>>       
>> _______________________________________________
>> Users mailing list
>> Users at lists.opensips.org
>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>
>>   
>>     
>
> _______________________________________________
> Users mailing list
> Users at lists.opensips.org
> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>
>