Last-Come, First-Served

The intercom pairing queue is Last-Come, First-Served. If a
Bluetooth system has multiple paired Bluetooth systems for intercom
conversations, the last paired Bluetooth system is set as the First
Intercom Friend. For example, after the pairing procedures listed
above, Bluetooth system (D) is the First Intercom Friend of Bluetooth
system (A). Bluetooth system (C) is the Second Intercom Friend of
Bluetooth system (A), and Bluetooth system (B) is the Third Intercom
Friend of Bluetooth system (A).

Intercom Pairing Order                        Last-Come, First-Served