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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MH-C-EXTENSION
Some attribute types have additional value characteristics, as shown in Table 3-17.
Meanings of Attributes
The attribute types specify the following information:
MH-T-EXT-CRIT-FOR-DELIVERY
Indicates that the extensions are critical to the delivery of the communication. When 
MH-T-EXT-CRIT-FOR-DELIVERY is set to OM-TRUE, the extensions in the 
communication must be delivered with the communication. If the communication is to 
be delivered in a system that can not accept the extensions, then the entire message is 
returned as non-deliverable. When MH-T-EXT-CRIT-FOR-DELIVERY is set to 
OM-FALSE and the communication is to be delivered in a system that can not accept 
the extensions, the extensions are deleted and the communication is delivered without 
them. 
MH-T-EXT-CRIT-FOR-SUBMISSION
Indicates that the extensions are critical to the communication’s submission. When MH-
T-EXT-CRIT-FOR-SUBMISSION is set to OM-TRUE, the extensions in the 
communication must be submitted with the communication. If the communication is 
submitted to a system that can not accept the extensions, the entire communication is 
returned as non-deliverable. 
MH-T-EXT-CRIT-FOR-TRANSFER
Indicates that the extensions are deemed critical to the communication’s transfer. When 
MH-T-EXT-CRIT-FOR-TRANSFER is set to OM-TRUE, the extensions in the 
communication must be transferred with the communication. If the communication is 
transferred through a system that cannot accept the extensions, the entire communication 
is returned as non-deliverable. 
MH-T-EXTENSION-TYPE
Identifies the extended processing. 
MH-T-EXTENSION-VALUE
Parameterizes the extended processing. 
Table 3-17. MH-C-EXTENSION Attributes—Additional Characteristics
Attribute Type Value Characteristics
MH-T-EXT-CRIT-FOR-DELIVERY Initial Value: OM-FALSE
MH-T-EXT-CRIT-FOR-SUBMISSION Initial Value: OM-FALSE
MH-T-EXT-CRIT-FOR-TRANSFER Initial Value: OM-FALSE










