The value of sapTlsPppUserDb specifies the local user database
to use for PPP PAP/CHAP based authentication.
If no authentication with the local user database is required, the
value of this object must be set to the empty string.
The value of sapTlsPppUserDb is only valid for a SAP
with a sapSubType value of 'capture'. If the value is set
to a non-empty string for a SAP with a sapSubType value
other than 'capture', an 'inconsistentValue' error will
be returned.
The value of sapTlsPppUserDb is used for PPP sessions
where the value of
TIMETRA-SUBSCRIBER-MGMT-MIB::tmnxSubPppType is equal to
'oA', as opposed to 'oE' or 'oEoA'.