Maximum Number of Group Chat Participants (CUPS 9.1)

[Matthias Dohm]

Hello everyone,

does anyone know the maximum number of partcipants in an ad-hoc group chat? Is there a limit at all?

I haven't been able to find an information in the documentation or in the srnd.

Regards

Matthias

[George Thomas]

I havent seen any documentation but i hit the 50 user limit with 9.1.

[Jaime Valencia]

I found some similar info with that same number, it appears there might be a script that enables this to go up to 250, but you need to engage TAC for that.

[George Thomas]

Thanks Jaime, good to know.

[Matthias Dohm]

In the meantime, I found this table in the Configuration and Administration Guide. I am a little sceptical though, because of the huge discrepancy between "250 with TAC support" and "1000 out of the box"...

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/im_presence/configAdminGuide/9_1/CUP0_BK_C68AA046_00_config-admin-guide-imp-91/CUP0_BK_C68AA046_00_config-admin-guide-imp-91_chapter_00.html#CUP0_RF_C98C30A6_00

The following table lists the chat room limits for IM and Presence Service.

Table 1 Chat Room Limits for IM and Presence Service

Number Of...	Maximum
Persistent chat rooms per node	1500 rooms
Total rooms per node (ad-hoc and persistent)	16500 rooms
Occupants per room	1000 occupants
Messages retrieved from the archive This is the max number of messages that are returned when a user queries the room history.	100 messages
Messages in chat history displayed by default This is the number of messages that are displayed when a user joins a chat room.	15 messages

[George Thomas]

Keep in mind Persistent chat and adhoc chat are different. 

[Matthias Dohm]

Yes I know that. Persistent chat should be more complex. I suppose, that's why one node can handle 1.500 persistent chat rooms and 15.000 ad-hoc sessions.

[George Sotiropoulos]

Check the following, you can invite around 100 participants to the group chat:

https://collaborationhelp.cisco.com/article/en-us/n1vljz2

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