Maximum Number of Conference Participants on Hardware CFB: a small note

IOS earlier than 12.4(15)T supports 8 participants per conference session.

IOS equal or later than 12.4(15)T supports 32 participants per conference session.

Found on CUCM SRND:

“A conference based on these DSPs allows a maximum of 8 participants. When a conference begins, all 8 positions are reserved at that time. Starting with Cisco IOS Release 12.4(15)T, this limit on the maximum number of participants has been increased to 32.”


About Mijanur Rahman
Mijanur started blogging to save and share his study and research notes. A deep diver in technologies and loves to participate in technical brainstorming. Proud father of two wonderful daughters loves to spend time with them. He writes about the topics that people deal with every day mainly on technology arena. To get in touch contact him at

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