Analysis RTP ports

I want clarification for RTP that used by PBX into side

192.168.2.3:8198                192.168.2.11:5060       192.168.2.2:60475


       RTP(g711a)                    RTP(g711u) 
10200 ---------------> 14738    16552 -------------> 4000

Agent A:192.168.2.3
FreePBX IP: 192.168.2.11
Agent B: 192.168.2.2

Agent A use: 10200 for RTP
Agent B use: 4000
but freePBX use 14738 and 16552 for RTP

 from Agent A to Freepbx 14738
 from FreePBX to Agent B 16552

Are this true?

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