OXE analog trunk issue ( I can hear the caller but he could not hear me)

[Asahhaf]

Hi experts ,
I have installed OXE system, and have APA8 analog trunk card , programming is done ( kindly check the attached config pic)
When tried to call from out side ,I can hear the caller but the caller could not hear me ( voice from my side ) the area is Saudi Arabia .( All sets are ALE-300 IP phones and working fine internally )
Any advise please with thanks.

[vad]

If you connect analogue phone directly to the external line - you have voice in both direction?
If you use another port on APA8 card - problem the same?

[Asahhaf]

Yes when connect external analogue to the line there is voice in both sides.
When connect the APA8 PROTS and call , the problem occurred ( I can hear the caller , but he could not hear me)

[vad]

Not clear with another ports. If you use another APA8 port - problem the same?
One way conversation - in both case (incoming and outgoing call)?

If in both - I suggest - make wireshark trace. You can find - RTP flow absent from GD. Or your voice present on GD and you have some problem in your LAN.