Hi,
you need to have a common mysql table for the registrations so that when
OpenSER_2 taks over it has the informations
OpenSER_1 wrote in the DB.
you can achieve this with a single mysql server, or better with a cluster ;)
cheers,
Patrick.
> Hi friends,
>
> I am having problems setting up seamless openser registrar failover. I am
> trying to setup OpenSER registrar HA using
> 2 openser registrars v1.3.0 behind a Netscaler citrix Load balancer and I
> cant get the failover scenario to work
> without re-registration of the remote sip client.
>
> I am desperately looking for tips to make this configuration work or any
> other ideas to achieve SIP registrar HA
> using OpenSER. Thanks.
>
>
>
> The setup is configured as active-passive and the 2nd OpenSER becomes active
> only after a Openser_1 fails and the LB
> fails-over to the 2nd. The 2 openser servers are SIP registrars for my voice
> network.
>
> REGISTRATION:
> remote SIP UA ---> remote firewall ---> internet ---> my firewall ---> citrix
> NA loadbalancer (VIP) ----> openSER_1
>
> \--->
> openSER_2
>
> 1. Remote SIP client configures the LB VIP as the SIP proxy and registers
> 2. the citrix LB gets the registrations and forwards to the active openser
> (say, openser_1)
> 3. openser_1 stores the contact as MIP:port in the mysql database
> 4. openser_1 replicates the registration to openser_2 (t_replicate)
>
> OUT-GOING CALL - before fail-over
> remote SIP UA <--- remote firewall <--- internet <--- my firewall <--- citrix
> NA loadbalancer (VIP) <----> openSER_1
>
> ^
> openSER_2 |
>
> Asterisk
>
> 1. call (INVITE) is generated from asterisk and sent to LB VIP
> 2. the citrix LB gets the INVITE and forwards to the active openser (say,
> openser_1)
> 3. openser_1 looks-up the URI in the MySQL database, finds the MIP:port
> that the registration was received from the
> LB and forwards the INVITE to that destination. 4. the LB receives the
> INVITE and forwards it to the remote SIP
> client
>
>
> OUT-GOING CALL - after fail-over
> remote SIP UA ---x remote firewall ---x internet ---x my firewall ---x
> citrix NA loadbalancer (VIP) ----x openSER_1
>
> ^
> \-----< openSER_2 |
>
> Asterisk
>
> 1. call (INVITE) is generated from asterisk and sent to LB VIP
> 2. the citrix LB gets the INVITE and forwards to the openser now active
> (openser_2)
> 3. openser_2 looks-up the URI in the MySQL database, finds the same
> MIP:port of the LB that was replicated from
> openser_1 and forwards the INVITE to that destination. 4. the LB receives
> the INVITE and drops the packet without
> forwarding it out to the remote SIP client
>
>
>
> For the outgoing call to work: the remote sip client either has to
> re-register, so the registration gets passed to
> openser_2. OR, openser_1 is made active again.
>
>
> Configuration of OpenSER:
>
> REGISTRATION:
> # If this is a registration from the public UA,
> # then we store it
> fix_nated_contact(); # use ip address of the packet instead
> of the sip message
> force_rport(); # append rport. might not be necessary
>
> # save Registration in location table
> save("location");
> xlog("L_DBG", "SipMsgId[$mi] Save Registration: To[$tu]
> Contact[$ct]\n");
> append_hf("CtlRegFwd: \r\n");
> # replicate the register message to the backup registrar
> # if I am the backup, ignore the message
> if(!t_replicate("sip:openser_2:5060")) {
> xlog("L_WARN", "SipMsgId[$mi] Fail to replicate
> Contact[$ct] to fail over registrar\n");
>
> OUTGOING CALL:
>
> # Do lookup so it gets to the correct NATed destination
> if (!lookup("location"))
> {
> # this user has not REGISTERed or registration has expired
> xlog("L_INFO", "SipMsgId[$mi] Send 404-Not Found (Msg
> rejected because user not found)\n");
> sl_send_reply("404", "Not Found");
> exit;
> };
>
> # keep track of reply
> t_on_reply("11");
> if (!t_relay())
> {
> xlog("L_DBG", "SipMsgId[$mi] Failed t_relay. Do sl_reply_error.\n");
> sl_reply_error();
> };
>
>
>
> Thank you for your anticipated help.
>
> Regards,
>
> Buki A
--
Patrick Miccio
UPC ECC Core ISP Services
UPC Austria GmbH
Center Ost, St. Peter Gürtel 10b
A-8042 Graz
T +43 (0) 59 999 0
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