I’m working on an Asterisk Box which is connected to 4 analogical lines, with a TDM400P card. Those lines are used only for incoming calls, to keep the old numbers.
The outgoing calls are made using a VoIP service provider, which lately is having serious QoS problems because of an upgrade of its systems. Because of that, now we want to redirect the ooutgoing calls to the analogical lines when the VoIP is not available.