What do you call the process when one bridge calls into another bridge so that participants on both bridges can see and hear each other?

Traversal refers to crossing network or firewall boundaries using protocols like ICE or TURN, not to linking two conferencing bridges together.

Interworking refers to protocol translation between different communication standards or endpoints, such as SIP-to-H.323 conversion, not bridge interconnection.

Flowing is not a recognized or standard term in video conferencing infrastructure for any bridge connection process.

Cascading refers specifically to the topology where one MCU or bridge dials into another bridge, linking their participant pools into a single logical conference. This technique is used to extend capacity beyond a single bridge and is a formally defined term in Cisco TelePresence architecture for bridge-to-bridge connections.