I have configured a simbox connected with a BRI interface. Config:
no ip address
isdn switch-type basic-net3
isdn tei-negotiation first-call
isdn incoming-voice voice
isdn static-tei 0
The customer notices very bad quality and call drops. What can I do to make sure the quality is good and calls are not dropped? We use the same simbox for other customers, but they don't have any problem with it.