A CUCM end user with Extension Mobility is associated with an 8851 phone and 8851 device profile. However, the user logs into a Cisco 8941, which device profile will be used?
A. 8941 default device profile
B. 8851 default device profile
C. the 8851 device profile
D. universal device profile
I agree answer A.
A user with a different device profile can try to log in to a phone that is a different model than the user’s default device profile.
The phone takes on the default device profile whenever a user logs in to a phone for
which that user does not have a user device profile.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/10_0_1/ccmfeat/CUCM_BK_F3AC1C0F_00_cucm-features-services-guide-100/CUCM_BK_F3AC1C0F_00_cucm-features-services-guide-100_chapter_011000.pdf
John is right,
More Current Cisco link here
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/10_0_1/ccmfeat/CUCM_BK_F3AC1C0F_00_cucm-features-services-guide-100/CUCM_BK_F3AC1C0F_00_cucm-features-services-guide-100_chapter_011000.pdf
For example, the following scenarios occur when a user who has a user device profile that is configured for
Cisco Unified IPPhone 7975 logsin to a Cisco Unified IPPhone 7906, and the default device profile is loaded
on the phone.
• The user can access the user hold audio source, user locale, userid, speed dials and directory number
configuration. The user cannot access phone line setting; the system configured the phone line setting
from the default device profile that is configured for the Cisco Unified IP Phone 7906.
• The user can access the phone template and the softkey template of the Cisco Unified IP Phone 7906.
• The user cannot access an addon module because Cisco Unified IP Phone 7906 does not support it.
• The user can access Cisco Unified IP Phone Services if they are configured for the Cisco Unified IP
Phone 7906, but the parameters from the subscriber services will reflect the default device profile, not
the parameters that the user chose on the Cisco Unified Communications Self Care Portal.
The right answer is A
from: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/8_6_1/ccmcfg/bccm-861-cm/b06dpdef.pdf
For example, a user logs on to a Cisco Unified IP Phone 7960, for which there is a user device profile.
The user device profile for the user gets downloaded to the phone to which the user logged on. Later, the
same user logs on to a Cisco Unified IP Phone 7940, for which he does not have a user device profile.
In this case, the default device profile for the 7940 gets downloaded to the phone.
From page 249 of CIPTV2:
For example, a user is associated with a device profile for a Cisco Unified IP Phone 7945 running SCCP. If this user logs on to a Cisco Unified IP Phone 7965 running SIP, some features exist on the target phone that cannot be configured at the Cisco Unified IP Phone 7945 device profile. In this case, the configuration parameters that are unavailable on the user’s device profile are taken from the default device profile of the Cisco Unified IP Phone 7945 SCCP
So B is the answer
I think the answer is A:
CUCM Guide
se the default device profile for whenever a user logs on to a phone model for which no user device profile exists. To create a default device profile for each phone model that supports Cisco Extension Mobility, use the Default Device Profile Configuration window. The maximum number of default device profiles cannot exceed the number of phone models that support Cisco Extension Mobility.