+ signal-cli -a ACCOUNT register
+
+ You can register Signal using a landline number. In this case, you need to follow the procedure below:
+ * Attempt a SMS verification process first (`signal-cli -a ACCOUNT register`)
+ * You will get an error `400 (InvalidTransportModeException)`, this is normal
+ * Wait 60 seconds
+ * Attempt a voice call verification by adding the `--voice` switch and wait for the call: