ā07-25-2023 03:04 AM
Hiļ¼
we are facing issues with registration about Cisco IP phone CP 7821 with CIsco router 2921ć The IP phones are on the branch and CIsco router 2921 are on the headquarter.There is an WAN dedicated line between the branch and the headquarterć We have the following IOS versions:
cisco IOS version: Version 15.2
CME versionļ¼11.6
Cisco IP phone : 7821
when the WAN link failes and recoverd , the phone can not registerd to the CME automatically. We need to reset the access switch port which the phone connected on the branch and clear the Firewall session connection on the headquarterć
Why the ip phone can not registerd with CME automatically when the network connection recovered? How we should optimize the network config ?
Solved! Go to Solution.
ā07-25-2023 04:55 AM
You need to check from the firewall "We need to reset the access switch port which the phone connected on the branch and clear the Firewall session connection on the headquarterć"
Make user the SIP inspections is disabled on firewall. if not disable and try.
ā07-25-2023 03:53 AM
Hello @gushuhua,
SCCP or SIP firmware ?
ā07-25-2023 04:41 AM
The phone used SIP firmware .
ā07-25-2023 04:57 AM
Thanks @gushuhua,
do you have log for about that issue ?
ā07-25-2023 05:00 AM
There's no logs about that issue and it occurs the fisrt time.
ā07-25-2023 04:56 AM
7821 are SIP phones and dont support SCCP.
ā07-25-2023 04:59 AM
Right @Nithin Eluvathingal!
There's no Skinny for 78xx nor 88xx nor newer IP phone models.
Thanks for that clarification.
ā07-25-2023 04:55 AM
You need to check from the firewall "We need to reset the access switch port which the phone connected on the branch and clear the Firewall session connection on the headquarterć"
Make user the SIP inspections is disabled on firewall. if not disable and try.
ā07-25-2023 05:10 AM
Thank for your suggestion, I will check it.
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