AT&T MERLIN LEGEND Release 3.1 System Planning Manual page 109

Selecting Line/Trunk Options
One-way, Outgoing Tie Trunks. Tie trunks are assigned to personal
line or Pool buttons on telephones. Select immediate signaling.
One-way, Incoming Tie Trunks. Dialed Number Identification
Service (DNIS) is included. Select wink signaling.
4. Under the E&M Signal heading, select one of the following signaling
types to be used on the tie trunks:
NOTE:
E&M Signaling does not apply to digital emulated Tie trunks using T1
Switched 56 service and should not be set during administration of those
trunks.
If the tie trunks are connected to the other system through the local
telephone company, check 1S (the factory setting).
If the tie trunks are connected directly to a system that uses type 1S
signaling and is located near this system, check 1C.
NOTE:
The 1C option assumes that the two systems are connected together
without any provisioned facility, and without any signaling treatment
equipment.
If the tie trunks are connected directly to a system that uses type 5
signaling and is located near this system, check 5.
5. To select dial mode:
a. Under the Inmode heading, check either the Touch-Tone column or
Rotary column (factory setting) for each incoming-only and each
two-way tie trunk.
NOTES:
1. If you have checked the Incoming or two-way column for a
2. Touch-Tone outmode can be used with Outtype Immediate trunks,
b. Under the Outmode heading, check either the Touch-Tone column or
the Rotary column (factory setting) for each outgoing-only and each
two-way tie trunk.
6. To indicate whether the system provides a dial tone for people calling in
on a tie trunk, check one of the following for each tie trunk under the Dial
Tone heading:
If the system provides a dial tone, check Remote (factory setting).
If the system does not provide a dial tone, check Local.
tie-trunk's direction and Immediate for its incoming signaling type,
you cannot use the Touch-Tone setting for Inmode.
but Touch-Tone Inmode cannot be used with Intype Immediate
Trunks.
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Lines/Trunks