You could try this:
LD 11 – Assign Automatic Line Selection for each Meridian 1 proprietary telephone.
Feature operation
No specific operating procedures are required to use this feature.
Prompt Response Description
REQ: CHG Change existing data.
TYPE: aaaa Telephone type, where:
aaaa = SL1, 2006, 2008, 2009, 2016, 2018, 2112, 2216,
2317, 2616, or 3000.
TN l s c u
c u
Terminal Number.
For Option 11C.
CLS (IRD) IRA(Deny) allow incoming ringing line preference.
(NID) NIA (Deny) allow incoming non-ringing line preference.
(OLD) OLA (Deny) allow outgoing line preference.
LPK xx Specify the last key to be scanned for line preference (such as 0-7, 10-17, 20-27).
Prompted only if CLS = IRA, NIA, or OLA.
Note: A value of 0 (zero) for LPK disables this feature.