It's now quite accurate to say that this port is "each RM HAS a TCP port assigned". It's very easy to get confused and think that the port is the usual SIP Port 5060.
You should better read the deployment guide instead of just reading the options' description from GA.
Typically, the cluster section of each RM should look like the following (for active-standby mode):
[cluster]
electiontimer=3000
failoverscript=$InstallationRoot$/bin/NLB.bat
ha-mode=active-standby
heartbeattimer=2000
hotstandby=true
member.1=10.228.194.210:9801
member.2=10.228.194.209:9801
members=1 2
mymemberid=2
networkrecoverytime=5000
virtual-ip=10.228.101.39
So, the port for which you wonder about is the 9801. You can chose any other unoccupied port but the 9801 is kind of "standard" port and recommended to keep. You should change it though if on the same server with RM you have an SSG installed (due to 9801 used for https). Also, please keep in mind that member.2 is the Primary and member.1 is the Backup. And whenever member.2 RM is started it goes always to Primary. There is not the usual Genesys notion of Primary/Backup/switchover here. If you have member.1 started and member.2 stopped and then you start member.2, then it goes automatically to Primary mode - no surprises here
But, please, read thoroughly the manuals - otherwise it doesn't make sense to explain more.
Kind Regards,
IF