Explanation of the @MON2 signals:
@mon2
..8906 -> Clear down channel 06.
..82 610708 -> Call from extension 6107 to VM port 08.
..8908 -> Clear down channel 08.
..98 -> heartbeat from MD to OCTEL.
..82 610710 -> Call from extension 6107 to VM port 10.
..8910 -> Clear down channel 10.
..82 610711 -> -> Call from extension 6107 to VM port 11.
..8911 -> Clear down channel 11.
..82 610712 -> Call from extension 6107 to VM port 12.
..8912 -> Clear down channel 11.
..82 610713 -> Call from extension 6107 to VM port 13.
..8913 -> Clear down channel 13.
..82 610715 -> Call from extension 6107 to VM port 13.
..8915 -> Clear down channel 15.
..98 -> heartbeat from MD to OCTEL.
..8401 -> External clla to VM port 01.
..82 610703 -> Call from extension 6107 to VM port 03.
..8903 -> Clear down channel 03.
..82 610704 -> Call from extension 6107 to VM port 04.
..98 -> heartbeat from MD to OCTEL.
..95 610702
..8904 -> Clear down channel 04.
..82 632610 Call from extension 61326 to VM port 03.
..8910 -> Clear down channel 10.
..82 615311 -> Call from extension 6153 to VM port 11.
..8911 -> Clear down channel 11.
Signalling seem OK from the MD to the OCTEL.
I thimk the fault lies in the analog port, not connected right:
After tests i my lab it seems to be that the analog ports to the OCTEL are not connected to the right port.
MD110: EXDDP

IR=1001; (EQU=x-x-xx-1) should be connected to the OCTEL port 1, and so on. All ports are (so it seems) wrong connected.
///doktor