Theres no way to limit or select which IP/Port combination is used from the available RTP IP/Port Range in the config you have.  The only way to do this would be to create a profile for each IP and then limit the number of calls per profile

From: FreeSWITCH-users [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Nabeel Ahmad
Sent: Tuesday, June 20, 2017 4:16 AM
To: freeswitch-users@lists.freeswitch.org
Subject: [Freeswitch-users] Call limit on RTP-IP Address

Hello all,

If we assign more then one RTP-IP parameter to a sip profile , they are used in round robin.

Its perfect . I want to know is there a way to use some limit on that ip ?

Say i've 5 ip address listening on box , and i want one concurrent call limit on each media ip.

How can i set limit on profile level or set from dialplan.

I tried to do but it didn't work .

Any help or advice will be highly appreciated

Thanking all 

Nabeel.