Re: [OSL | CCIE_Voice] Call Preservation Issue
Hi, Check following commands: gateway timer rtp/rtcp It might be disconnected because rtcp is dropped. Though i'm not sure it will help. Let us know Regards Kobel On Jun 1, 2011 2:52 AM, CCIE VOICE ccievoicelab.c...@gmail.com wrote: Thanks Amit but unfortunately this will not work. As I mentioned before, the RTP stream is being interrupted too. H323 call preservation, in my opinion, is only for signaling loss to the Call Manager only, but here the IP Phones are temporarily losing connectivity to the GW too which will interrupt the RTP stream. On Tue, May 31, 2011 at 7:54 PM, amit batra batraji...@yahoo.com wrote: try this http://ccieash.wordpress.com/2010/06/25/h323-call-preservation/ might help you... --- On *Wed, 6/1/11, CCIE Voice ccievoicelab.c...@gmail.com* wrote: From: CCIE Voice ccievoicelab.c...@gmail.com Subject: Re: [OSL | CCIE_Voice] Call Preservation Issue To: amit batra batraji...@yahoo.com Cc: ccie_voice@onlinestudylist.com Date: Wednesday, June 1, 2011, 4:34 AM Sorry, should have been more clear. Using H.323. The call preservation feature of H323 applies when the gateway loses connectivity to Call Manager only, so that the RTP stream is preserved to the phone, but here the RTP stream itself is being interrupted. On May 31, 2011, at 6:58 PM, amit batra batraji...@yahoo.com http://mc/compose?to=batraji...@yahoo.com wrote: What type of protocol you are using ? H323 or MGCP ? With MGCP i dont think if there is any way .. H323 can preserve call .. --- On *Wed, 6/1/11, CCIE VOICE ccievoicelab.c...@gmail.com http://mc/compose?to=ccievoicelab.c...@gmail.com * wrote: From: CCIE VOICE ccievoicelab.c...@gmail.com http://mc/compose?to=ccievoicelab.c...@gmail.com Subject: [OSL | CCIE_Voice] Call Preservation Issue To: http://mc/compose?to=ccie_voice@onlinestudylist.com ccie_voice@onlinestudylist.com http://mc/compose?to=ccie_voice@onlinestudylist.com Date: Wednesday, June 1, 2011, 3:03 AM Hello Experts An interesting problem to solve for which I'm having a hard time figuring out the solution myself. We have a Call Manager node and IP Phones in one location and ingress voice gateways in other location. Both locations are connected over redundant WAN links. When one WAN link fails, it takes upto 5 seconds for the redundant WAN link to kick in. Issue is, if there is an active call between the gateway and the IP Phone, the call simply drops when a WAN issue occurs. Is there a way to preserve the RTP stream on the GW itself that can be resumed once the redundant WAN link takes over? Any input is appreciated! -Inline Attachment Follows- ___ For more information regarding industry leading CCIE Lab training, please visit http://www.ipexpert.comwww.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out http://www.PlatinumPlacement.comwww.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
[OSL | CCIE_Voice] Call Preservation Issue
Hello Experts An interesting problem to solve for which I'm having a hard time figuring out the solution myself. We have a Call Manager node and IP Phones in one location and ingress voice gateways in other location. Both locations are connected over redundant WAN links. When one WAN link fails, it takes upto 5 seconds for the redundant WAN link to kick in. Issue is, if there is an active call between the gateway and the IP Phone, the call simply drops when a WAN issue occurs. Is there a way to preserve the RTP stream on the GW itself that can be resumed once the redundant WAN link takes over? Any input is appreciated! ___ 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
Re: [OSL | CCIE_Voice] Call Preservation Issue
Sorry, should have been more clear. Using H.323. The call preservation feature of H323 applies when the gateway loses connectivity to Call Manager only, so that the RTP stream is preserved to the phone, but here the RTP stream itself is being interrupted. On May 31, 2011, at 6:58 PM, amit batra batraji...@yahoo.com wrote: What type of protocol you are using ? H323 or MGCP ? With MGCP i dont think if there is any way .. H323 can preserve call .. --- On Wed, 6/1/11, CCIE VOICE ccievoicelab.c...@gmail.com wrote: From: CCIE VOICE ccievoicelab.c...@gmail.com Subject: [OSL | CCIE_Voice] Call Preservation Issue To: ccie_voice@onlinestudylist.com Date: Wednesday, June 1, 2011, 3:03 AM Hello Experts An interesting problem to solve for which I'm having a hard time figuring out the solution myself. We have a Call Manager node and IP Phones in one location and ingress voice gateways in other location. Both locations are connected over redundant WAN links. When one WAN link fails, it takes upto 5 seconds for the redundant WAN link to kick in. Issue is, if there is an active call between the gateway and the IP Phone, the call simply drops when a WAN issue occurs. Is there a way to preserve the RTP stream on the GW itself that can be resumed once the redundant WAN link takes over? Any input is appreciated! -Inline Attachment Follows- ___ 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
Re: [OSL | CCIE_Voice] Call Preservation Issue
Thanks Amit but unfortunately this will not work. As I mentioned before, the RTP stream is being interrupted too. H323 call preservation, in my opinion, is only for signaling loss to the Call Manager only, but here the IP Phones are temporarily losing connectivity to the GW too which will interrupt the RTP stream. On Tue, May 31, 2011 at 7:54 PM, amit batra batraji...@yahoo.com wrote: try this http://ccieash.wordpress.com/2010/06/25/h323-call-preservation/ might help you... --- On *Wed, 6/1/11, CCIE Voice ccievoicelab.c...@gmail.com* wrote: From: CCIE Voice ccievoicelab.c...@gmail.com Subject: Re: [OSL | CCIE_Voice] Call Preservation Issue To: amit batra batraji...@yahoo.com Cc: ccie_voice@onlinestudylist.com Date: Wednesday, June 1, 2011, 4:34 AM Sorry, should have been more clear. Using H.323. The call preservation feature of H323 applies when the gateway loses connectivity to Call Manager only, so that the RTP stream is preserved to the phone, but here the RTP stream itself is being interrupted. On May 31, 2011, at 6:58 PM, amit batra batraji...@yahoo.comhttp://mc/compose?to=batraji...@yahoo.com wrote: What type of protocol you are using ? H323 or MGCP ? With MGCP i dont think if there is any way .. H323 can preserve call .. --- On *Wed, 6/1/11, CCIE VOICE ccievoicelab.c...@gmail.comhttp://mc/compose?to=ccievoicelab.c...@gmail.com * wrote: From: CCIE VOICE ccievoicelab.c...@gmail.comhttp://mc/compose?to=ccievoicelab.c...@gmail.com Subject: [OSL | CCIE_Voice] Call Preservation Issue To: http://mc/compose?to=ccie_voice@onlinestudylist.com ccie_voice@onlinestudylist.comhttp://mc/compose?to=ccie_voice@onlinestudylist.com Date: Wednesday, June 1, 2011, 3:03 AM Hello Experts An interesting problem to solve for which I'm having a hard time figuring out the solution myself. We have a Call Manager node and IP Phones in one location and ingress voice gateways in other location. Both locations are connected over redundant WAN links. When one WAN link fails, it takes upto 5 seconds for the redundant WAN link to kick in. Issue is, if there is an active call between the gateway and the IP Phone, the call simply drops when a WAN issue occurs. Is there a way to preserve the RTP stream on the GW itself that can be resumed once the redundant WAN link takes over? Any input is appreciated! -Inline Attachment Follows- ___ For more information regarding industry leading CCIE Lab training, please visit http://www.ipexpert.comwww.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out http://www.PlatinumPlacement.comwww.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
Re: [OSL | CCIE_Voice] Call Preservation Issue
try this http://ccieash.wordpress.com/2010/06/25/h323-call-preservation/ might help you... --- On Wed, 6/1/11, CCIE Voice ccievoicelab.c...@gmail.com wrote: From: CCIE Voice ccievoicelab.c...@gmail.com Subject: Re: [OSL | CCIE_Voice] Call Preservation Issue To: amit batra batraji...@yahoo.com Cc: ccie_voice@onlinestudylist.com Date: Wednesday, June 1, 2011, 4:34 AM Sorry, should have been more clear. Using H.323. The call preservation feature of H323 applies when the gateway loses connectivity to Call Manager only, so that the RTP stream is preserved to the phone, but here the RTP stream itself is being interrupted. On May 31, 2011, at 6:58 PM, amit batra batraji...@yahoo.com wrote: What type of protocol you are using ? H323 or MGCP ? With MGCP i dont think if there is any way .. H323 can preserve call .. --- On Wed, 6/1/11, CCIE VOICE ccievoicelab.c...@gmail.com wrote: From: CCIE VOICE ccievoicelab.c...@gmail.com Subject: [OSL | CCIE_Voice] Call Preservation Issue To: ccie_voice@onlinestudylist.com Date: Wednesday, June 1, 2011, 3:03 AM Hello Experts An interesting problem to solve for which I'm having a hard time figuring out the solution myself. We have a Call Manager node and IP Phones in one location and ingress voice gateways in other location. Both locations are connected over redundant WAN links. When one WAN link fails, it takes upto 5 seconds for the redundant WAN link to kick in. Issue is, if there is an active call between the gateway and the IP Phone, the call simply drops when a WAN issue occurs. Is there a way to preserve the RTP stream on the GW itself that can be resumed once the redundant WAN link takes over? Any input is appreciated! -Inline Attachment Follows- ___ 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
Re: [OSL | CCIE_Voice] Call Preservation Issue
Voice service VoIP H323 Call preserve Should be the command set. I use it as my default configuration. Sent from my iPhone On May 31, 2011, at 4:04 PM, CCIE Voice ccievoicelab.c...@gmail.com wrote: Sorry, should have been more clear. Using H.323. The call preservation feature of H323 applies when the gateway loses connectivity to Call Manager only, so that the RTP stream is preserved to the phone, but here the RTP stream itself is being interrupted. On May 31, 2011, at 6:58 PM, amit batra batraji...@yahoo.com wrote: What type of protocol you are using ? H323 or MGCP ? With MGCP i dont think if there is any way .. H323 can preserve call .. --- On Wed, 6/1/11, CCIE VOICE ccievoicelab.c...@gmail.com wrote: From: CCIE VOICE ccievoicelab.c...@gmail.com Subject: [OSL | CCIE_Voice] Call Preservation Issue To: ccie_voice@onlinestudylist.com Date: Wednesday, June 1, 2011, 3:03 AM Hello Experts An interesting problem to solve for which I'm having a hard time figuring out the solution myself. We have a Call Manager node and IP Phones in one location and ingress voice gateways in other location. Both locations are connected over redundant WAN links. When one WAN link fails, it takes upto 5 seconds for the redundant WAN link to kick in. Issue is, if there is an active call between the gateway and the IP Phone, the call simply drops when a WAN issue occurs. Is there a way to preserve the RTP stream on the GW itself that can be resumed once the redundant WAN link takes over? Any input is appreciated! -Inline Attachment Follows- ___ 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 ___ 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
Re: [OSL | CCIE_Voice] call preservation issue
I think you might be running into one of 2 issues I have experienced. (1) is binding mgcp control packets to a Loopback interface or SVI. Try removing the mgcp bind commands no mgcp/mgcp and then test. The backhaul link that the gw tries to establish with the redundant host might not be invoked due to this bug. (2) no mgcp timer receive-rtcp on the mgcp gw- the gw might still be running this timer for packets from the sub (which is down) and after 50s this timer could cause the call to drop. -- Vik Malhi CCIE #13890 Managing Partner / Instructor - IPexpert, Inc. Mailto: vma...@ipexpert.com Telephone: +1.810.326.1444 ext 420 Fax: +1.810.454.0130 Live Assistance, Please visit: www.ipexpert.com/chat http://www.ipexpert.com/chat IPexpert is a premier provider of Self-Study Workbooks, Video on Demand, Audio Tools, Online Hardware Rental and Classroom Training for the Cisco CCIE (RS, Voice, Wireless, Security Service Provider) certification(s) with training locations throughout the United States, Europe, South Asia and Australia. Be sure to visit our online communities at www.ipexpert.com/communities http://www.ipexpert.com/communities and our public website at www.ipexpert.com http://www.ipexpert.com/ From: CCIE Voice cc...@corb.net Date: Wed, 19 Jan 2011 09:18:08 -0700 To: OSL Group ccie_voice@onlinestudylist.com Subject: [OSL | CCIE_Voice] call preservation issue Hello All: I have a scenario which I discovered while trying to troubleshoot mgcp call preservation and noticed that calls were NOT being preserved. All the MGCP gateway configs looked correct. I then noticed that even IP phone - to - IP Phone calls were being dropped. I am simulating subscriber failure by manually shutting the call manager service on the subscriber. As soon as I do this, all IPphone-to-IPphone calls drop (as well as calls to pstn via MGCP gateway) Both pub and sub have call manager service running and phones can register and process calls when registered to either server. There is a call manager group in use by all phones listing sub first then pub. Phones do show primary secondary call servers in device/UCM Config on the phones. Stopping call manager service on sub kills all calls even between IP phones. I am hoping that someone may have experienced something similar. A friend of mine seemed to recall a bug that was found and discussed in this forum a year or so ago but I could not find anything. Thanks in advance! scd ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
Re: [OSL | CCIE_Voice] call preservation issue
Thanks Vik...I will try that but this issue occurs even with a non-gateway call. 2 phones registered to call manager with an active callI stop the call mgr service on sub and call drops. Any ideas what that might be? My friend Amir Safayan will be in class with you next week in San Jose. Thanks for chiming in on this...it is a weird one. scd On Wed, Jan 19, 2011 at 10:37 AM, Vik Malhi vma...@ipexpert.com wrote: I think you might be running into one of 2 issues I have experienced. (1) is binding mgcp control packets to a Loopback interface or SVI. Try removing the mgcp bind commands no mgcp/mgcp and then test. The backhaul link that the gw tries to establish with the redundant host might not be invoked due to this bug. (2) no mgcp timer receive-rtcp on the mgcp gw- the gw might still be running this timer for packets from the sub (which is down) and after 50s this timer could cause the call to drop. -- Vik Malhi – CCIE #13890 Managing Partner / Instructor - IPexpert, Inc. Mailto: *vma...@ipexpert.com *Telephone: +1.810.326.1444 ext 420 Fax: +1.810.454.0130 Live Assistance, Please visit: www.ipexpert.com/chat * http://www.ipexpert.com/chat* IPexpert is a premier provider of Self-Study Workbooks, Video on Demand, Audio Tools, Online Hardware Rental and Classroom Training for the Cisco CCIE (RS, Voice, Wireless, Security Service Provider) certification(s) with training locations throughout the United States, Europe, South Asia and Australia. Be sure to visit our online communities at www.ipexpert.com/communities *http://www.ipexpert.com/communities* and our public website at www.ipexpert.com *http://www.ipexpert.com/* From: CCIE Voice cc...@corb.net Date: Wed, 19 Jan 2011 09:18:08 -0700 To: OSL Group ccie_voice@onlinestudylist.com Subject: [OSL | CCIE_Voice] call preservation issue Hello All: I have a scenario which I discovered while trying to troubleshoot mgcp call preservation and noticed that calls were NOT being preserved. All the MGCP gateway configs looked correct. I then noticed that even IP phone - to - IP Phone calls were being dropped. I am simulating subscriber failure by manually shutting the call manager service on the subscriber. As soon as I do this, all IPphone-to-IPphone calls drop (as well as calls to pstn via MGCP gateway) Both pub and sub have call manager service running and phones can register and process calls when registered to either server. There is a call manager group in use by all phones listing sub first then pub. Phones do show primary secondary call servers in device/UCM Config on the phones. Stopping call manager service on sub kills all calls even between IP phones. I am hoping that someone may have experienced something similar. A friend of mine seemed to recall a bug that was found and discussed in this forum a year or so ago but I could not find anything. Thanks in advance! scd ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
