Max Registered/built Devices - CUCM 11.5/7.5 OVA

[Austin Sabio]

I am hoping to verify the max number of registered/configured devices in CUCM. Please note that we are building MRA devices (CSF, BOT, TAB and TCT) for 7,000 users so technically we are looking at 28000 potential MRA devices plus 7500 physical devices which brings the total to 35,500.

The concern is with potentially 35,500 devices built in CUCM - this could affect the database.

considering our CCS CUCM cluster size is at 7.5k OVA

CUCM System version: 11.5.1.15900-18

cluster nodes 

Host-------- Server Type
im-pub --------CUCM IM and Presence
im-sub2 -------- CUCM IM and Presence
moh1 --------CUCM Voice/Video
moh2 --------CUCM Voice/Video
pub1 --------CUCM Voice/Video
sub1 --------CUCM Voice/Video
sub2 --------CUCM Voice/Video
sub3 --------CUCM Voice/Video
sub4 --------CUCM Voice/Video
tftp1 --------CUCM Voice/Video
tftp2 --------CUCM Voice/Video

According to the SRND (11.5), the max number of devices configured is 40,000 but I am not positive if this is applied in our case at 7.5K OVA.  

Maximum of 40,000 configured and registered Skinny Client Control Protocol (SCCP) or Session Initiation Protocol (SIP) IP phones, softphones, analog ports, video endpoints, SIP-based TelePresence endpoints and room-based TelePresence conferencing systems, mobile clients, and Cisco Virtualization Experience Clients (VXC) per Unified CM cluster.

Cisco Collaboration System 11.x Solution Reference Network Designs (SRND) - Collaboration Deployment Models [Cisco Unified Communications Manager (CallManager)] - Cisco

looking forward for your feedback. 

Thanks. 

[Jaime Valencia · Accepted solution]

40K devices is assuming you have 1 PUB + 8 SUBs using the 10K users OVA, using 1:1 redundancy.

If you use only the SUBs, you don't even get to the count you need, and you should not be using the PUB for registration.

And even if you use the PUB, you would have no redundancy.

Then if you're going to have BOT and TCT for everyone then you'll also add extra-load to the server even if they're not used:

[doc] Jabber Devices(BOT/TCT) counted as registered when just configured

CSCur73944

I strongly suggest you reach out to a local Partner WITH UC specializations to discuss this with them and properly size the cluster for your needs.

[Austin Sabio]

Indeed. I have reached to the same conclusion. Thank you for your feedback. 

Notes on 7,500 user VM configurations (top)

Use for publishers, subscribers, standalone TFTP, standalone multicast MOH nodes, ELM or PAWS-M.
User count based on:
1 device per user
7.5K phones per VM
30K max phones per cluster
45K max BHCC per VM
180K max BHCC per cluster
Your design/results may vary

Notes on 10,000 user VM configurations (top)

Use for publishers, subscribers, standalone TFTP, standalone multicast MOH nodes, ELM or PAWS-M.
User count based on:
1 device per user
10K phones per VM
40K max phones per cluster
60K max BHCC per VM
240K max BHCC per cluster
Your design/results may vary

https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/uc_system/virtualization/older_pages/virtualization-cisco-unified-communications-manager-older.html#7500userVM