MYERSTON@SRI-KL.ARPA (HECTOR MYERSTON) (12/05/85)
The San Francisco Bay Area NPA's (415/408) do not yet require the
use of 1+ for dialing Long Distance numbers. The dialing pattern is NPA
NXX XXXX for calls outside the NPA and NXX XXXX for calls within.
Several new Voice Mail/Automatic Attendant systems such as OPCOM and
Centrigram which allow the user to dial additional digits to access
internal extensions without Attendant Assistance have recently come on
the market. Typically an experienced user would dial NXX XXXX AAA where
AAA represent the additional extension or control digits.
The problem is that many call accounting/SMDR systems base call
costing on wheter the call is seven or ten digits and wether the first
three digits dialed "look like" an NPA. We recently experienced this
problem with a local call to NXX 887. The user dialed 887 XXXX AAA, the
call completed as dialed, SMDR recorded ten digits, looked up NPA 887
and found a valid match!.
Inquiries to BellCore Traffic Routing revealed that 887 is listed as
a valid NPA "For Internal Use".
It appears that need for 1+ dialing in AC (415) and (408) may be
closer than we suspected.
HECTOR O MYERSTON
Supv Telecom Analysis
SRI International
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