You can use BAT to work with the following types of devices and records:
Add, update, and delete Cisco Unified IP Phones including voice gateway (VG) phones, computer telephony interface (CTI) ports, and H.323 clients, and migrate phones from Skinny Client Control Protocol (SCCP) to Session Initiation Protocol (SIP).
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/bat/12_5_1/cucm_b_bulk- administration-guide-1251/cucm_b_bulk-administration-guide-1251_chapter_01.html

The 11 classes of the QoS baseline model, defined by Cisco, include the following:
1. Network Control (e.g., routing protocols, control traffic)
2. Signaling (e.g., call signaling protocols such as SIP, H.323)
3. Broadcast Video (e.g., one-way live video streams)
4. Realtime Interactive (e.g., two-way voice and video traffic)
5. Multimedia Streaming (e.g., video streams with less interactivity)
6. Mission-Critical Data (e.g., high-priority business data)
7. Transactional Data (e.g., database interactions, financial apps)
8. Bulk Data (e.g., backups, large file transfers)
9. Scavenger (e.g., traffic with the lowest priority)
10. Best Effort (e.g., typical non-critical traffic)
11. Network Management (e.g., SNMP, NTP traffic)
Reference:
https://www.cisco.com/en/US/technologies/tk543/tk759/technologies_white_paper0900aecd8029
5a9b.pdf

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/10_0_1/ccmcfg/CUCM_BK_ C95ABA82_00_admin-guide-100/ CUCM_BK_C95ABA82_00_admin-guide-100_chapter_01010.html

Cisco Unity Connection is the voicemail system in a Cisco Collaboration environment. While it is commonly deployed alongside MRA solutions to provide voicemail services to remote users, it is not a mandatory component of the MRA architecture itself. MRA primarily focuses on enabling secure communication and remote access for endpoints.
In a Mobile and Remote Access (MRA) solution, the following components are essential:
- Cisco Expressway-C: The internal component of the MRA architecture. It connects to Cisco UCM and facilitates communication between the internal network and Cisco Expressway-E.
- Cisco Expressway-E: The external-facing component that resides in the DMZ. It provides firewall traversal and secures communication for remote endpoints.
- Cisco Unified Communications Manager (UCM): Acts as the call control system, managing SIP endpoints and providing call routing.
Reference: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X12-
5/exwy_b_mra-expressway-deployment-guide/exwy_b_mra-expressway-deployment- guide_chapter_00.html