We have the below setup
Analog Phone --> PABX --> Voice Gateway --> CUCM --> IP Phones
Are are able to place calls between the PABX phones and the IP phones. However, we do not get any audio after the call is picked up.
Have tried to place a call between the PABX phones routing thru the voice gateway. Also faced the same issue.
Would like to know if anyone has faced similar problem, or have any advice on area to look into.