I followed the guide Configuring UCM6XXX with GXW410X from Grandstream to make Inbound and Outbound calls through the PSTN gateway.
Inbound calls work as expected: the PSTN gateway forwards inbound calls to the UCM, which then manages them.
Outbound calls on the hand do not seem to work. I configured a route, allowed an extension to use the route, but I have the voice message : “Tous les circuits sont occupés” (I’m translating: All circuits are busy).
Where can I start to look?
Thank you in advance.