<div dir="ltr">Hi,<div><br></div><div>I am using FreesWITCH with Sangoma 102 and E1 connection. When I make a call from a fixed number to one of the internal extensions, ringback can be heard on the fixed number. However, when I make a call from a cell phone, although the internal extension rings, I cannot hear any ringing on the cell phone. I have tried two different mobile phone operators, but the result is the same. I have tried specifying the channel variables such as ringback and transfer_ringback int he dialplan, but doesn't help.</div>
<div><br></div><div>Any pointers on how to debug this? Could it be the telco, in between the cell phone operators and FS, causing this?</div><div><br></div><div>Thanks!</div></div>