In regards to Q1, you are accurate in that: - When the GW fails over to the backup call agent, it will send a RSIP (not shown in your trace, perhaps not pertinent to your question)
- The call agent will send AUEP messages to the MGCP GW for each endpoint - The MGCP GW responds to AUEP with a 200 OK with the local call identifier (I:) and if I: is blank, there is no call on that particular endpoint - For each AUEP response that had a non-blank I: value, the call agent will send a AUCX message requesting the global call ID and connection mode - The MGCP GW responds accordingly with a 200 message and the appropriate C: and M: values - At this point, the backhaul connection is taking care of sending/receiving a status enquiry and appropriate response from the PSTN In regards to Q2, if you are seeing that call preservation fails on your MGCP device then you will want to check your configuration. Specifically, ensure that you have "no mgcp timer receive-rtcp" configured. -- William Bell, CCIE #38914 blog: http://ucguerrilla.com twitter: @ucguerrilla On Apr 16, 2013, at 11:41 AM, sanity insanity wrote: > hi Guys, > > Have not heard back on this... > > > On Thu, Apr 11, 2013 at 9:29 PM, sanity insanity > <networksanitytoinsan...@gmail.com> wrote: > Hi Guys, > > > I have a MGCP gateway setup when subscriber fail publisher will work > Call 911 while the call is active shut down the cucm sub services. Make sure > when > Complete to bring up the subscriber services so you can continue with the > tasks on the lab. > Capture the following > -- Backup call agent sends the message to the gateway to check the status > of the active call > OR > -- Backup call agent sends the message to the gateway to check the status of > the First call > -- Gateway sends the status of active calls to the secondary call agent. > -- Back up call agent send a message back to the GW requesting additional > information > about the call > > > My configuration snip looks like this :- > > ccm-manager switchback immediate > ccm-manager fallback-mgcp > ccm-manager redundant-host <ip address of pub> > ccm-manager mgcp > ccm-manager config server <ip address of sub> <ip address of pub> > > > here are the events noted from debug mgcp packets : > ============== ======================================== > > > **Event1: Backup call-agent sends the message to gw to check the status of > active call for port 12 > > Apr 11 05:26:26.911: MGCP Packet received from <ip address of pub>:2427---> > AUEP 178 S0/SU1/DS1-0/1...@r1.ccievoice.com MGCP 0.1 > F: X, A, I > <--- > > > > **Event2:Gateway sends the status message of active calls to the backup > call-agent for port 12 > > Note: Nothing mentioned in I: so it refers no call present in this port > > > > Apr 11 05:26:26.915: MGCP Packet sent to <ip address of sub>:2427---> > 200 181 > I: > X: 0 > L: p:10-20, a:PCMU;PCMA;G.nX64, b:64, e:on, es-cci, gc:1, s:on, t:10, r:g, > nt:IN > ;ATM;LOCAL, v:T;G;D;L;H;ATM;FXR > L: p:10-220, a:G.729;G.729a;G.729b, b:8, e:on, es-cci, gc:1, s:on, t:10, r:g, > nt > > > **Event3: Backup call-agent requesting additional information about the > active call on port 23 > > Apr 11 05:28:28.936: MGCP Packet received from <ip address of pub>:2427---> > AUCX 213 S0/SU1/DS1-0/2...@r1.ccievoice.com MGCP 0.1 > I: 3 > F: C, M > <--- > > > Questions : > ========================= > > > 1) Are the above events I have elaborated correct? Please correct me If I am > wrong. > > > 2) I tried to test call preservation on this setup . On an active call when > I break the connection between MGCP gateway and subsriber, the gateway then > registers > with the publisher . However instead of the call staying up ...I see the ip > phone showing "Temp fail" and the call to pstn drops . Why? > > > > Thanks & Regards, > MJ > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
