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
From agent A, port 10,200 to FreePBX port 14,738
From FreePBX, port 16,552, to agent B port 4,000
From FreePBX, port 14,738, to agent A, port 10,200
From agent B, port 4,000, to FreePBX, port 16.552.
There is nothing unusual in that; it’s how SDP works; each party selects the ports at its end.