04-25-2011 11:47 PM - edited 03-06-2019 04:47 PM
Hi All,
Can anyone explain to me why this is happening, is it the cable problem or something wrong the switch, this only happen when we ping our Cisco Callmanager. Why is the ping is like dropping every 6th packet. This is our local network and we are having problem with our phone registration because of this. (See attachement)
The callmanager is connected to 2960G switch and the core switch is Cisco 4500 series. All internal routing is done at core switch.
Thanks.
Solved! Go to Solution.
04-26-2011 12:49 AM
Hi Razmir,
04-26-2011 12:46 AM
That is normal icmp rate limiting, as you would have found by searching before posting.
04-26-2011 12:49 AM
Hi Razmir,
04-26-2011 01:11 AM
Hi,
Thank you for your response. It looks like something else is dropping our sccp packets. Some of our sccp IP Phone are unable to join the Call Manager. According to Cisco TAC after reviewing our packet sniffing result, it looks like something is dropping the packet since there is a lot of tcp retransmission on the phone side. At the moment, there are still no solution I will need to look into others possibilities..
Thanks guys..
12-17-2011 05:11 PM
Did this ever get answered for you? I am having the exact same issue with a handfull of SCCP phones. Work arounds was to migrate them to SIP. Please let me know. Thanks Ken
01-31-2012 02:45 AM
Ken,
Is there any firewall between the home IP phones and CUCM? (The reason why I am asking because in call manager 4.x, 5.x, 6.x all use SCCP version 16, however call manager 7.X and 8.X Use SCCP version 17 and some firewalls do not recognized version 17 at all, therefore it drops any Skinny registration packets sent from the phone.)
Hope this answers your query why changing to SIP worked for you.
Akhi
10-24-2015 09:24 AM
Hello,
You can verify if currently on your firewall is in use TCP state bypass, this might sometimes is related to unregistered phones or issues when registering devices to your CUCM.
Link=http://www.cisco.com/c/en/us/td/docs/security/asa/asa82/configuration/guide/config/conns_tcpstatebypass.html
Regards,
Gerson
08-21-2015 08:06 AM
Hello,
You can check if at the firewall you have configured SCCP inspection as this configuration normally makes SCCP to lose icmp messages finishing on unregistered phones or issues at the time of registering them.
05-22-2018 08:22 PM
i agree this post is helpful
12-20-2018 07:18 AM
Do you know if this behavior is replicated on Finesse Servers also?? I get the same result......
01-29-2019 06:21 AM
Really glad I stumbled on this old but still relevant post (still relevant on CUCM version 11.5 SU5). Thanks!
10-15-2013 02:25 PM
our CUC and CUCCx that share the same host in the ESX5.0 had the same OS and share the same behaivor
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide