Ankit:
Does the manager's DN (the one in the Manager_PT) have a CSS which can access the IPMA (RP) partition?
3 partitions and 2 CSS are to be created
PT_everyone, PT_IPMA, PT_Manager
CSS_IPMA_Everyone: Should contain the PT_everyone and PT_IPMA
CSS_Manager_Everyone: Should contain the PT_everyone and PT_Manager
Remember the setup of CSS and PT should be as follows:
Assistant's proxy line--> PT: Everyone, CSS Manager-Everyone
IPMA CTI RP --> PT IPMA, CSS: Manager-Everyone
Manager's line --> PT: Manager, CSS IPMA-Everyone
Also, remember the Assistant should have the manager assigned in the end user configuration and the other way around.
Hope this helps!