CUCM Call Pickup Not Working

[mrzcn]

Hello everyone, have a good week.

CUCM System version: 12.0.1.21900-7.
Users complained that they could not pick up a ringing phone even though they were members of the same call pickup group.

Then, when I tested it by including my own phone in a different location, I saw that it still didn't work.
A - calls B.
C - Press OK, then select "pick-up" from the menu.
C- An error message appears on the phone, such as no suitable call found.
A, B, and C are members of the same pickup group.

What would you suggest I check?

I search on the internet and Cisco forum, couldn't find any solution until now. 
Thanks in advance.

[Leonardo Santana]

Hi,

The CSS of the IP Phones have access to the partition of the call pick groups numbers?

[mrzcn]

Hi Leonardo, 

Yes, IP Phone's CSS has permission to dial the Pickup group's partition. 

Do you have another suggestion?

[zpalmer]

It's a bug, the work around is set the busy trigger to 2 instead of 1 or update.

CSCvz38358