Nortel Media Gateway 3200 User Manual page 408

All the trunks on the specific MG3200 are displayed. Verify the Trunk CLLI to ensure they are
the right trunks to be Man Bsy'ed.
Sample screenshot:
3. Busy out the trunks:
From the 'Maintenance Action' pull-down list, select 'Busy Endpoints (BSY)'
4. Verify that the state of the trunks are in Man Busy state
User's Manual 408
MG 3200
Document # LTRT-72704