I have realized about one isue, that happens to different Freepbx systems I have working. Those systems work with a SIP trunk each. Inbound calls and outbound calls work perfect, sounds good and everyting seem to be fine.
The problem starts when I forward inbound calls to a ring group, where a mobile number is set. When a call is not attended, every calls are sent to this group with a number finished with"#". The call is transfered but when answered there is no sound in any way. 2 telephones are mutted.
It happens in different systems. Normal outbound calls to this mobile number work fine.
Any idea about this?