We have seen a number of cases where the customer receives the error "Cisco Agent Desktop login fails with the You cannot log in because your phone is ipv6 enabled". This happens even when EM is not enabled.
When EM is enabled:
Complete these steps:
1. Access the CallManager end user configuration page.
2. Under controlled devices, associate the MAC address of the IP phone with the end user.
3. Add the user to the standard CTI enabled user group, and then add the phone in rmcm user.
Complete these steps:
1. Choose CUCM Administration > Device > Phone, and click the IP phone on which the issue occurs.
2. Choose Device > Device Settings > Common Device Configuration.
3. Under the common device configuration, change the IP Addressing Mode to IPv4 only.
4. From the CUCM phone configuration page, reset the IP phone.
5. Reset the TFTP and CTIManager services.
Also, follow this sequence:
1)Disassociate the phone from the RmCm user
2) Reset the phone
3) Reassociate the phone with RmCm user
4) Reset the phone
This can be tracked under the defect: CSCti18636
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We have seen this issue when EM is not enabled also. In such a situation, please find the details of the following defect:
CSCtk00173
Symptom:CAD login fails with a misleading error message that the phone is IPv6 enabled.
Conditions:When CAD logs in after a fresh install or W1 upgrade.
Workaround:Re-start UCCX engine
Hope this helps!
