GW1600 One way audio

Im having an issue where i'm successfully making a call from call manager express (CME), the call is completing but audio is only one way.Both the gateway and CME are on the same network segment, but I hear nothing back from GSM

Audio from CME handset to GSM mobile is OK

Hi,

Sorry to make trouble with you,it should relate with the settings!Please let me check it for you remotely!
My contact info be shown as below:

Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Skype: rick.zhu3

Best Regards.