Cisco Telepresence Endpoint CE Software (CE8) Multiway replaced by Ad-Hoc

Cisco TelePresence CE Software Release Notes (CE8)

What’s the difference between a multiway conference and an ad hoc conference?

It’s the call control device. With a multiway conference, we’re using VCS. With an ad hoc conference, it’s Cisco Unified Communications Manager that’s being used as the call control device.

When using a VCS, from the telepresence endpoint s’perspective such as SX series running the CE TC software, you need to select the Multiway option as a Multipoint Mode in the GUI of the endpoint, and the conference is triggered with a “merge” soft button on the display connected to the SX series.
But this configuration is valid before the CE 8.0.0 Software version.

In Cisco TelePresence SX, MX and DX Series Collaboration Endpoint Software 8 Multiway is replaced by ad-hoc conferencing (requires CUCM MediaResourceGroupList).

Adding participants with MRGL Valid:

From CE8.0.0 through CE8.2.1:  If you are already connected to an MCU it is not possible to add/merge an incoming call. The “Add” button is replaced with “Answer & Hold” in the incoming call dialog. When you dial into an MCU hosted conference the opportunity to add additional participants was removed to avoid cascaded conferences as this may break content share functionality between the cascaded conferences. 

From CE8.2.2:  The above change has been modified and the “add” button is available. Keep in mind that if you “add” a participant while already in an MCU call, a cascaded conference may be created (connecting two conferences on two different MCUs hosted at different locations) and content sharing between the two conferences may not work as expected in this scenario. The merge button has been modified and the “add” button is available.

CUCMMediaResourceGroupList means that a Multiparty conferences (ad hoc conferences) are hosted by the CUCM configured conference bridge. This setting is provisioned by CUCM in a CUCM environment and should never be set manually by the user.

Why these changes?

The VCS call control is end of life, and all video endpoints are now supported by CUCM, and since the Multiway is an option in VCS, not on CUCM, a new feature to replace the Multiway feature is needed, this is why Cisco replaced the multiway option by CUCM MediaResourceGroupList option and decided to do this change in the TC software CE 8.X.

Published by:

Redouane MEDDANE

Redouane MEDDANE is Cisco Instructor CCSI #35458, 3xCCNP Collaboration, Security and Enterprise and he a published author of some of the most important OSPF Protocol, Security and Collaboration books in the world titled OSPF Demystified With RFC, Network Security All-in-one, and Dial Plan and Call Routing Demystified on CUCM. He is also a blogger at and writes articles about collaboration and security to demystify the most complex topics. His books are known for their technical depth and accuracy especially the OSPF Demystified With RFC book, which is considered as the best OSPF book in the world and named "One of the best OSPF ebooks of all time" by BookAuthority It gives you a hint at the ability to explain complex topics with remarkable ease. He worked as a Cisco Instructor and consultant indifferent Cisco Learning Partner and awarded twice as Cisco Distinguished Instructor Award and Cisco Security Instructor Excellence Award on 2018 and 2019, and Cisco Collaboration Instructor Excellence Award on 2020. The Distinguished Instructor Award recognizes the top 5% of Cisco's most influential CCSI's who provide the highest quality training experience and demonstrate the best overall instructor performance across multiple Cisco technologie and Instructor Excellence Award recognizes the top 25% of elite CCSIs being recognized for delivering top quality training and maintaining high customer satisfaction in their field of expertise.

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