CUCM 6.1.3 Failover Issue - Some phones do not register with Standby Server
I have two CUCM server in a cluster ( 1 Publisher & I subscriber) . I defined one call manager group called "CMG_Prtoduction" and have added subscriber as first CM and Publisher as second CM. I have created a device pool called "DP_Production". DP_Production is set to use CUCM Group CMG_Production. All our phones are set to use device pool "DP_Production". All phones are obtaining IP automatically from DHCP. DHCP option 150 is set Publisher first choice & Subscriber second choice which I believe is used for phone configuration file.
I took subscriber of the network and found 60% phones (1700) failed over and registered with publisher but about 1500 phones couldn't register at all and were displaying "Registering" message on the phone. Please help on " How to troubleshoot / rectify this type of issue"
Action Taken - I have checked the access-list / connectivity issue and all looks in order. I defined a new vlan and dhcp scope. I setup a test phone in new vlan. I set dhcp option 150 as Publisher only. I created a Call Manager group CMG_Test and only added Publisher in the list. CMG_Test "Auto-registration Cisco Unified Communications Manager Group" setting is not checked. I created a device pool called DP_Test. DP_Test is set to use CMG_Test. Test phone doesn't register at all and continues to show "Registering message" but as soon as I add subscriber to CMG_test test phone registers with subscriber.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.