ReadMe for Cisco Unified Communications Manager Release 15SU4a

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/sustaining/cucm_b_readme-15su4a.html

Published

2026-07-29

Updated

unknown

Accessed

2026-09-30

HTTP status

200

License

Cisco website terms of use; no-redistribution; short excerpts and locators only

Source notes citing this source

• Unified CM Release 15 cannot be installed on bare-metal server hardware; it must run on virtual machines. in context
• From 15SU3 onward, Unified CM virtual machines need a physical host CPU that supports AVX (Advanced Vector Extensions). in context
• Unified CM 15SU4a is ISO build 15.0.1.14901-2. in context
• The 15SU4a ISO no longer bundles end-of-support phone firmware; the cmterm-eol_endpoint-15.0.1.10000-32 COP file can be installed if that firmware is needed. in context
• PhoneOS firmware for the 8875 and 9800 series phones ships natively in the 15SU4a ISO and is installed by default. in context
• Direct upgrade to 15SU4a is supported from Unified CM 12.5(1), 14, and 15 through 15SU3/SU3a, including 15 ES builds from 15.0.1.11001-3 to 15.0.1.14026-1; older releases need a PCD migration. in context
• As of 2026-09-30, the newest Unified CM build with published ReadMe and release notes is 15SU4a, and Version 14 has passed its end of software maintenance, so new deployments and upgrades would normally target 15SU4a or later. inferred in context

Cite this source record

APA

WarmTransfer. (2026, July 29). ReadMe for Cisco Unified Communications Manager Release 15SU4a. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-readme-cucm-15su4a

BibTeX

@misc{warmtransfer-cisco-readme-cucm-15su4a,
  title  = {ReadMe for Cisco Unified Communications Manager Release 15SU4a},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-readme-cucm-15su4a},
  note   = {Cisco Systems, accessed 2026-09-30}
}