Nortel Circuit Card 311 Reference page 754

754 NT8D15 E and M Trunk card
Figure 244
E and M Type I signaling patterns - originating party release on a tandem connection
Incoming calls The far-end initiates calls as follows:
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The ground is placed on the E lead in E and M signaling.
Dial pulses are subsequently applied from the far-end as ground open
on the E lead.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008