OSI/MHS Gateway Programmatic Interface (GPI) Reference Manual

Object Classes and Attribute Types
OSI/MHS Gateway Programmatic Interface (GPI) Reference Manual—522223-001
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IM-C-G3-FAX-BODY-PART
specific strings when the accumulated length of the strings might overflow the total
string area specified in the max-table-data parameter of the GPI_INITIALIZE_
procedure call.
For inbound messages, the Gateway Interface Process automatically specifies OM-
S-ONFILE-STRING for those strings that exceed the value in the max-table-data
parameter of the GPI_INITIALIZE_ call or that exceed the maximum length
specified in the max-in-memory-string-len parameter of the
GPI_MT_START_TRANSFER_IN_ call.
Attributes that have the syntax OM-S-ONFILE-STRING are treated as long strings,
regardless of their actual length: that is, they are treated as if they were longer than
the specification of the max-string-len parameter of GPI_INITIALIZE_. Thus, you
can use only the procedure calls GPI_OM_READ_ and GPI_OM-WRITE_ to read
and write the values of strings that have the syntax OM-S-ONFILE-STRING.