Modem: iiNet TG-1 (Which I think is a branded NetComm Wireless NB16WV-02)
I was having troubles connecting to FTTN and noticed these log entries.
Jan 1 00:03:32 daemon notice syslog: PPP: Start to connect ...
Jan 1 00:03:55 daemon err syslog: pppd:Couldn't get channel number: Transport endpoint is not connected
Jan 1 00:03:55 daemon notice syslog: pppd:Couldn't reset tty to normal line discipline: Inappropriate ioctl for device
Jan 1 00:03:55 daemon notice syslog: pppd:Doing disconnect
Solution: Was a line fault, line had to be correctly jumpered at node.