You are able to connect a total of 15 people on your basewith 3 available full duplex talk paths to share among the 15 users. It’s a firstcome first served situation. The 4^th person will need to wait untila talk path becomes available to talk. All 15 can hear the conversations butonly 3 can latch and talk at the same time. If you find that you need more than3 talk paths you will need to add additional bases. You get 3 available talkpaths per base with 15 additional users per base and you can add a total of 4bases together. So in the 2 channel mode you can have a grand total of 12 fullduplex talk paths with 60 users. This is a brief explanation so if you havemore questions please contact us if you have more questions.