Character position definition and scope:

A one-character alphabetic code indicates whether or not the telephones have been lowered and whether handset amplifiers are available to accommodate people and disabilities.

Guidelines for applying content designators:

Code:

Description:

a

No lowered telephones or handset amplifiers

b

Lowered telephones and handset amplifiers

c

Lowered telephones only

d

Handset amplifiers only

e

No telephones

n

Not applicable

u

Unknown

See also:

007  Physical Description Fixed Field

Variable Control Fields