Release Notes for Cisco Unified Communications Manager Release 15SU4a and the IM and Presence Service Release 15SU4

Publisher

Cisco Systems, Inc.

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/rel_notes/15/SU4/cucm_b_release-notes-for-cucm-imp-15su4.html

Published

2026-03-17

Updated

unknown

Accessed

2026-09-04

HTTP status

200

License

Cisco proprietary documentation, all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• APIC-EM integration is removed in Release 15 and replaced by DSCP QoS management through service parameters. in context
• For a Release 15 (FCS) node to interoperate with nodes on 15SU1 or later for Location Bandwidth Manager, the COP file ciscocm.V15FCS_CSCwi82830-lbm_C0211-1.cop.sha512 is required. in context
• Remote Call Control with Microsoft Lync Server is not supported in Release 15. in context
• Call Control Discovery via Service Advertisement Framework is deprecated in Release 15, and Cisco directs customers to Intercluster Lookup Service (ILS). in context
• The 32-bit Windows TAPI Service Provider is deprecated in Release 15; integrations must move to the 64-bit TSP plugin. in context
• 15SU4 adds Webex Calling Hybrid for Customer Assist, a hybrid model that combines cloud-based agent functions with on-premises Unified CM telephony. in context
• Unified CM 15SU4 adds support for Cisco NFVIS-for-UC and Cisco Compute Hyperconverged with Nutanix (CCHN), alongside the existing VMware vSphere ESXi 8.0 support. in context
• In 15SU4 the Microsoft Office 365 calendaring integration moves from Exchange Web Services to Microsoft Graph APIs to keep calendar-based presence working. in context
• Before upgrading from a release earlier than 15SU3, deployments that use RSA-based encryption should add strong ciphers first. in context
• Build numbers for that release are 15.0.1.14901-2 for Unified Communications Manager 15SU4a and 15.0.1.14900-8 for IM and Presence Service 15SU4. in context
• The most recent Cisco Unified Communications Manager release documented at the time of research is Release 15SU4a, paired with IM and Presence Service Release 15SU4. in context
• The 15SU4 release notes say VMware vSphere ESXi 8.0 continues to be supported, and that ESXi 7.0 and earlier have reached end of support from VMware by Broadcom. in context
• Unified CM Release 15SU4 adds support for Cisco NFVIS-for-UC as a hypervisor, with a minimum of Release 15SU4 (X15.4 for Expressway) running on NFVIS-for-UC 4.18.2a. in context
• Release 15SU4 supports Unified CM on Cisco Compute Hyperconverged with Nutanix (Cisco HCI nodes and connected compute nodes on HCI, HCIX and UCS hardware), with a minimum of Nutanix AHV 10.0 and AOS 7.0. in context
• The Version 15 virtualization page still lists ESXi 7.0 U3, while the 15SU4 release notes say ESXi 7.0 is past VMware end of support. The page's ESXi list is therefore probably out of date for 15SU4 and later. inferred in context
• On NFVIS-for-UC and Nutanix AHV, 15SU4 supports Unified CM, Unified CM Session Management Edition, IM and Presence, Unity Connection, Emergency Responder, Expressway and the Dedicated Instance Enhanced Survivability Node. in context
• NFVIS-for-UC supports only select Cisco appliances: Business Edition 6000 and 7000 (M5, M6, M7) and Expressway CE1400V (M7). in context

Cite this source record

APA

WarmTransfer. (2026, March 17). Release Notes for Cisco Unified Communications Manager Release 15SU4a and the IM and Presence Service Release 15SU4. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-relnotes-cucm-15su4a

BibTeX

@misc{warmtransfer-cisco-relnotes-cucm-15su4a,
  title  = {Release Notes for Cisco Unified Communications Manager Release 15SU4a and the IM and Presence Service Release 15SU4},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-relnotes-cucm-15su4a},
  note   = {Cisco Systems, Inc., accessed 2026-09-04}
}