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Have you got the wiring of the TSU-T / MSU correct? Use pair 4 (not pair 1), TSU-T requires a good volume, MSU is not as demanding.

In AU the TLU64 is for TPH14 protocol (Old Telstra) & will not work with properly ETSI. Symptoms are chanels 17-31 one way speech. TLU76 has ETSI eeproms & works OK with ETSI. TLU64 can be programmed but MAY have problems depending on country it was released in.

Automatic alarm output (ALDIP;) is turned on by ALAPI:IODEV=SYSTERMINAL,CLASS=X&&X; (or IO terminal from ALDIP;). To end ALAPE:IODEV=SYSTERMINAL; Alarm output to modem dialing to a remote terminal is not very reliable. Alarm can also come up if local terminal collecting alarm data is off or...

It is possible to send alternate ID within extension / indial range: NUTRI:CNVTYP=1,NUMTYP=10,ENTRY=XXXX,TRC=XXXX,PRE=XXXX;

The Octel sends MW requests to the MD110, it is likely that virtual mailboxes (i.e. mailboxes not matching an extension number in your network) are sending MW to extensions that do not exist. This will raise this alarm. Turn off the "MW activate" for the virtual numbers on the Octel VM, or...

ISDN extensions are based in ISDN Basic rate "S bus" parameters, maximum recommended S Bus is 100 meters. S Bus extender units may be comercially available.

NIU1 suppports SCSI hard drive interface only, NIU2 supports ATA hard drive of flash card interface only.