Problem while trying to change udp port for sip plugin

Hello,
I’m having trouble modifying the RDP port range in Janus. I’m trying to set the range in janus.jcfg from 10,000 to 20,000 and in janus.plugin.sip from 20,000 to 40,000.
However, the application keeps allowing random ports between 0 and approximately 65,000.
Could anyone please help me with this issue?
Thanks in advance.