© 2026 Cisco and/or its affiliates. All rights reserved.
Page 19 of 34
CPU
vendor/architecture
codename & details
on their website
(unlisted
vendors/architectures
not supported)
Supported CPU model
ranges
(unlisted ranges not
supported)
Example Model
(Cores / Base Frequency)
Example Cisco Product IDs
Xeon 5200 Gold (52xx) *
Xeon 4200 Silver (42xx) *
Intel Xeon Skylake
Link
Xeon 8100 Platinum (81xx)
Xeon 6100 Gold (61xx)
Xeon 5100 Gold (51xx) *
Xeon 4100 Silver (41xx) *
6132 (14C / 2.60 GHz)
4114 (10C / 2.20 GHz)
UCS-CPU-6132
HX-CPU-6142
UCS-CPU-4114
- Only supported for deployments of <1K users and <2.5K devices
VM Placement Rules
●
Unless explicitly indicated otherwise in the application Installation Guide, deployments must follow
these rules: Physical CPU cores: Each server must provide a total physical core quantity at least
equal to the sum of all virtual machines' vcpus. For example, if your physical server is 2S/10C, you
may run any combination of VMs totaling 20 vCPUs.
●
If Hyperthreading is present in the hardware BIOS, always enable, but ignore any Logical Processor
quantity shown in ESXi.
●
ESXi CPU Reservations are hardcoded in the Cisco-provided OVA and may not be changed.
Applications do not use CPU Reservations to control VM placement.
RAM / Memory Requirements
General
●
If Cisco Calling Appliance, the memory configuration is selected by default in the appliance model
(no changes are supported). For more details, see Install Guide of each appliance.
- Cisco Unified Communications Manager and the IM and Presence Service
- Cisco Expressway Installation Guide
- Cisco Emergency Responder Administration Guide
●
For Cisco General-purpose and 3rd-party General-purpose hardware, must follow:
◦ Physical memory hardware must be supported by the hardware vendor.
◦ Cisco applications do not prescribe memory module quantity, density, speed, or layout/population.
Follow instructions from the CPU vendor and your hardware provider. For Cisco UCS, see the server
model's Spec Sheet and Memory Guide.