In a Cisco Unified Contact Center Enterprise deployment, the following have been created in the Cisco Unified Communications Manager:

There are two partitions:
UCCE – Contains CTI route points and agent phone DNs
INTERNAL – Contains CTI ports

There are three calling search spaces:
GW_CSS – Contains UCCE partition
CTI_CSS – Contains UCCE partition
AG_CSS – Contains UCCE and INTERNAL partitions

In this configuration, PSTN calls to CTI route points are failing to get into the Cisco Unified IP IVR for queuing treatment. Internal calls from agent phone to CTI route points get queuing treatment. What needs to be changed in the Cisco Unified Communications Manager to fix this issue?

A.
CSS (CTI_CSS) of the CTI route points should have partition INTERNAL.

B.
CSS (GW_CSS) of the Gateway should have partition INTERNAL.

C.
CSS (AG_CSS) of the agent phone should not have partition INTERNAL.

D.
It is a configuration problem in ICM as it cannot route calls to IP IVR.