02-24-2008 06:01 PM - edited 03-15-2019 09:02 AM
Hi Netpros,
I have a situation when sometimes an inbound call attempt is dropped before the connection is established. For example ... if I called a number on my company from a mobile or public phone .. the company phone rings once and dies before I get the chance to answer it.
We have call manager 4.1 and using 2821 configured as MGCP gateways (Primary and backup) using PRI. Both gateways show registration with Call manager ok when using show ccm. Unfortunately I have not been able to reproduce the issue and at the same time debug isdn q931. Any advice or links that could help me pinpointing this issue is much appreciated.
02-24-2008 09:07 PM
Reproduce the issue.
Detailed CCM traces
Exact CCM version
Exact Phone model and firmware
Shared lines?
Same Number?
Same B channel?
debug isdn q931
debug mgcp packet
Timestamps
IOS version
Check DSPs integrity.
http://www.cisco.com/en/US/products/hw/modules/ps2617/products_tech_note09186a008039c316.shtml
02-25-2008 06:59 AM
Is there an ATA involved? We have that issue with incoming calls going to An ATA first. two rings and then busy. I have to reset the switchport connected to the ATA.
No sure if this is your case.
02-25-2008 07:10 PM
you mean a cisco ATA Analog Telephone adaptor ..? no we don't use this,
Thanks,
02-25-2008 06:57 PM
Thanks,
I opened a TAC and was advised to enabled CCM detailed traces. I am currently waiting for the event to occur and will provide the logs to Cisco TAC.
Cheers,
02-25-2008 01:55 PM
Greetings,
Do you have the following statements in your MGCP GW configuration?
mgcp bind control source-interface XXX
mgcp bind media source-interface XXX
I've seen issues when the MGCP traffic is not binded to a specific port.
Regards,
Val
02-25-2008 06:55 PM
Hi,
Yes it has binded to the loopback interface. But thanks for your comments
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: