## MH_C_OR_ADDRESS

An instance of class MH_C_OR_ADDRESS distinguishes one user or DL from another, and identifies its point of access to the message transfer system (MTS). Every user or DL is assigned one or more MTS access points and thus one or more originator/recipient (O/R) addresses.

The attributes specific to this class are listed in the following table. The 1988 column indicates that the attribute applies only to the 1988 standard.Note 1

Attributes Specific to MH_C_OR_ADDRESS

Attribute | Value Syntax | Value Length | Value Number | 1988?
MH_T_ADMD_ NAME See Note 1 | String(OM_S_ PRINTABLE_ STRING) | 016 | 0 or 1 | -
MH_T_COMMON_ NAME | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 | 164 | 0-2 | 1988
MH_T_COUNTRY_ NAME See Note 1 | String(OM_S_ PRINTABLE_ STRING) | 2-3 | 0 or 1 | -
MH_T_DOMAIN_ TYPE_1 | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 and Note 3 | 1-8 | 02 See Note 4 | -
MH_T_DOMAIN_ TYPE_2 | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 and Note 3 | 18 | 02 See Note 4 | -
MH_T_DOMAIN_ TYPE_3 | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 and Note 3 | 18 | 02 See Note 4 | -
MH_T_DOMAIN_ TYPE_4 | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 and Note 3 | 18 | 02 See Note 4 | -
MH_T_DOMAIN_ VALUE_1 | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 and Note 3 | 1128 | 02 See Note 4 | -
MH_T_DOMAIN_ VALUE_2 | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 and Note 3 | 1128 | 02 See Note 4 | -
MH_T_DOMAIN_ VALUE_3 | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 and Note 3 | 1128 | 02 See Note 4 | -
MH_T_DOMAIN_ VALUE_4 | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 and Note 3 | 1128 | 02 See Note 4 | -
MH_T_ GENERATION | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 and Note 3 | 13 | 02 See Note 4 | -
MH_T_GIVEN_ NAME | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 and Note 3 | 116 | 02 See Note 4 | -
MH_T_INITIALS | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 and Note 3 | 15 | 02 See Note 4 | -
MH_T_ISDN_ NUMBER | String(OM_S_ NUMERIC_ STRING) | 115 | 0 or 1 | 1988
MH_T_ISDN_ SUBADDRESS | String(OM_S_ NUMERIC_ STRING) | 140 | 0 or 1 See Note 5 | 1988
MH_T_NUMERIC_ USER_ IDENTIFIER | String(OM_S_ NUMERIC_ STRING) | 132 | 0 or 1 | -
MH_T_ ORGANIZATION_ NAME | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 and Note 3 | 164 | 02 See Note 4 and Note 6 | -
MH_T_ ORGANIZATIONAL_ UNIT_NAME_1 | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 and Note 3 | 132 | 02 See Note 4 | -
MH_T_ ORGANIZATIONAL_ UNIT_NAME_2 | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 and Note 3 | 132 | 02 See Note 4 | -
MH_T_ ORGANIZATIONAL_ UNIT_NAME_3 | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 and Note 3 | 132 | 02 See Note 4 | -
MH_T_ ORGANIZATIONAL_ UNIT_NAME_4 | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 | 132 | 02 See Note 4 | -
MH_T_POSTAL_ ADDRESS_ DETAILS | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) | 130 | 02 | 1988
MH_T_POSTAL_ ADDRESS_ IN_FULL | String(OM_S TELETEX_STRING) | 1185 | 0 or 1 | 1988
MH_T_POSTAL_ ADDRESS_ IN_LINES | String(OM_S_ PRINTABLE_ STRING) | 130 | 06 | 1988
MH_T_POSTAL_ CODE | String(OM_S_ PRINTABLE_ STRING) | 116 | 0 or 1 | 1988
MH_T_POSTAL_ COUNTRY_ NAME | String(OM_S_ PRINTABLE_ STRING) | 23 | 0 or 1 | 1988
MH_T_POSTAL_ DELIVERY_ POINT_NAME | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 | 130 | 0-2 | 1988
MH_T_POSTAL_ DELIV_ SYSTEM_NAME | String(OM_S_ PRINTABLE_ STRING) | 116 | 0 or 1 | 1988
MH_T_POSTAL_ GENERAL_ DELIV_ADDR | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 | 130 | 02 | 1988
MH_T_POSTAL_ LOCALE | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 | 130 | 02 | 1988
MH_T_POSTAL_ OFFICE_ BOX_NUMBER | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 | 130 | 02 | 1988
MH_T_POSTAL_ OFFICE_ NAME | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 | 130 | 02 | 1988
MH_T_POSTAL_ OFFICE_ NUMBER | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 | 130 | 02 | 1988
MH_T_POSTAL_ ORGANIZATION_ NAME | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 | 130 | 02 | 1988
MH_T_POSTAL_ PATRON_ DETAILS | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 | 130 | 02 | 1988
MH_T_POSTAL_ PATRON_ NAME | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 | 130 | 02 | 1988
MH_T_POSTAL_ STREET_ADDRESS | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 | 130 | 02 | 1988
MH_T_ PRESENTATION_ ADDRESS | Object(DS_C_ PRESENTATION_ ADDRESS | - | 0 or 1 | 1988
MH_T_PRMD_ NAME | String(OM_S_ PRINTABLE_ STRING) | 116 | 0 or 1 | -
MH_T_SURNAME | String(OM_S_ PRINTABLE_ STRING) or String(OM_S TELETEX_STRING) See Note 2 and Note 3 | 140 | 02 See Note 4 | -
MH_T_TERMINAL_ IDENTIFIER | String(OM_S_ PRINTABLE_ STRING) | 124 | 0 or 1 | -
MH_T_TERMINAL_ TYPE | Enum(MH_ Terminal_ Type) | - | 0 or 1 | 1988
MH_T_X121_ ADDRESS | String(OM_S_ NUMERIC STRING) | 115 | 0 or 1 | -

· MH_T_ADMD_NAME

This attribute contains the name of the user's or DL's administration management domain (ADMD). It identifies the ADMD relative to the country that the MH_T_COUNTRY_NAME attribute indicates. Its values are defined by that country.

Note that the attribute value that comprises a single space is reserved. If permitted by the country that the MH_T_COUNTRY_NAME attribute indicates, a single space designates ''any'' - that is, all ADMDs within the country. This affects both the identification of users and DLs within the country and the routing of messages, probes, and reports to and among the ADMDs of that country. Regarding the former, it requires that the O/R addresses of users and DLs within the country be chosen so as to ensure their unambiguousness, even in the absence of the actual names of the users' and DLs' ADMDs. Regarding the latter, it permits private management domains (PRMD) within the country and ADMDs outside the country to route messages, probes, and reports to any of the ADMDs within the country indiscriminately. It also requires that the ADMDs within the country interconnect themselves in such a way that the messages, probes, and reports are conveyed to their destinations.

· MH_T_COMMON_NAME

This attribute contains the name commonly used to refer to the user or DL. It identifies the user or DL relative to the entity indicated by another attribute; for example, MH_T_ORGANIZATION_NAME. Its values are defined by that entity.

· MH_T_COUNTRY_NAME

This attribute contains the name of the user's or DL's country. Its defined values are the numbers that X.121 assigns to the country, or the character pairs that ISO 3166 assigns to it.

· MH_T_DOMAIN_TYPE_1

This attribute contains the name of a class of information. Its values are defined by the user's or DL's ADMD and PRMD, if any, in combination.

· MH_T_DOMAIN_TYPE_2

This attribute contains the name of a class of information. Its values are defined by the user's or DL's ADMD and PRMD, if any, in combination.

· MH_T_DOMAIN_TYPE_3

This attribute contains the name of a class of information. Its values are defined by the user's or DL's ADMD and PRMD, if any, in combination.

· MH_T_DOMAIN_TYPE_4

This attribute contains the name of a class of information. Its values are defined by the user's or DL's ADMD and PRMD, if any, in combination.

· MH_T_DOMAIN_VALUE_1

This attribute is an instance of the class of information that the MH_T_DOMAIN_TYPE_1 attribute indicates.

· MH_T_DOMAIN_VALUE_2

This attribute is an instance of the class of information that the MH_T_DOMAIN_TYPE_2 attribute indicates.

· MH_T_DOMAIN_VALUE_3

This attribute is an instance of the class of information that the MH_T_DOMAIN_TYPE_3 attribute indicates.

· MH_T_DOMAIN_VALUE_4

This attribute is an instance of the class of information that the MH_T_DOMAIN_TYPE_4 attribute indicates.

· MH_T_GENERATION

This attribute contains the user's generation; for example, Jnr.

· MH_T_GIVEN_NAME

This attribute contains the user's given name; for example, Robert.

· MH_T_INITIALS

This attribute contains the initials of all of the user's names except the user's surname; for example, RE.

· MH_T_ISDN_NUMBER

This attribute contains the ISDN number of the user's terminal. Its values are defined by E.163 and E.164.

· MH_T_ISDN_SUBADDRESS

This attribute contains the ISDN subaddress, if any, of the user's terminal. Its values are defined by E.163 and E.164.

· MH_T_NUMERIC_USER_IDENTIFIER

This attribute numerically identifies the user or DL relative to the ADMD that the MH_T_ADMD_NAME attribute indicates. Its values are defined by that ADMD.

· MH_T_ORGANIZATION_NAME

This attribute contains the name of the user's or DL's organization. As a national matter, such names may be assigned by the country that the MH_T_COUNTRY_NAME attribute indicates, the ADMD that the MH_T_ADMD_NAME attribute indicates, the PRMD that the MH_T_PRMD_NAME attribute indicates, or the latter two organizations together.

· MH_T_ORGANIZATIONAL_UNIT_NAME_1

This attribute contains the name of a unit (for example, a division or department) of the organization that the MH_T_ORGANIZATION_NAME attribute indicates. The attribute's values are defined by that organization.

· MH_T_ORGANIZATIONAL_UNIT_NAME_2

This attribute contains the name of a subunit (for example, a division or department) of the unit that the MH_T_ORGANIZATIONAL_UNIT_NAME_1 attribute indicates. The attribute's values are defined by the latter unit.

· MH_T_ORGANIZATIONAL_UNIT_NAME_3

This attribute contains the name of a subunit (for example, a division or department) of the unit that the DS_A_ORGANIZATIONAL_UNIT_NAME_2 attribute indicates. The attribute's values are defined by the latter unit.

· MH_T_ORGANIZATIONAL_UNIT_NAME_4

This attribute contains the name of a subunit (for example, a division or department) of the unit that the MH_T_ORGANIZATIONAL_UNIT_NAME_3 attribute indicates. The attribute's values are defined by the latter unit.

· MH_T_POSTAL_ADDRESS_DETAILS

This attribute contains the means (for example, a room and the floor numbers in a large building) for identifying the exact point at which the user takes delivery of physical messages.

· MH_T_POSTAL_ADDRESS_IN_FULL

This attribute contains the free-form and possibly multiline postal address of the user as a single Teletex string with the lines being separated as prescribed for Teletex strings.

· MH_T_POSTAL_ADDRESS_IN_LINES

This attribute contains the free-form postal address of the user in a sequence of printable strings, each representing a line of text.

· MH_T_POSTAL_CODE

This attribute contains the postal code for the geographical area in which the user takes delivery of physical messages. It identifies the area relative to the country that the MH_T_POSTAL_COUNTRY_NAME attribute indicates. Its values are defined by the postal administration of that country.

· MH_T_POSTAL_COUNTRY_NAME

This attribute contains the name of the country in which the user takes delivery of physical messages. Its defined values are the numbers X.121 assigns to the country, or the character pairs ISO 3166 assigns to it.

· MH_T_POSTAL_DELIVERY_POINT_NAME

This attribute identifies the locus of distribution, other than that indicated by the MH_T_POSTAL_OFFICE_NAME attribute (for example, a geographical area) of the user's physical messages.

· MH_T_POSTAL_DELIV_SYSTEM_NAME

This attribute contains the name of the postal delivery system (PDS) through which the user is to receive physical messages. It identifies the PDS relative to the ADMD that the MH_T_ADMD_NAME attribute indicates. Its values are defined by that ADMD.

· MH_T_POSTAL_GENERAL_DELIV_ADDRESS

This attribute contains the code that the user gives to the post office to collect the physical messages awaiting delivery to the user. The post office is indicated in the MH_T_POSTAL_OFFICE_NAME attribute. The values for the MH_T_POSTAL_GENERAL_DELIV_ADDRESS attribute are defined by that post office.

· MH_T_POSTAL_LOCALE

This attribute identifies the point of delivery, other than that indicated by the following attributes:

- MH_T_POSTAL_GENERAL_DELIV_ADDR

- MH_T_POSTAL_OFFICE_BOX_NUMBER

- MH_T_POSTAL_STREET_ADDRESS.

For example, a building or a hamlet of the user's physical messages.

· MH_T_POSTAL_OFFICE_BOX_NUMBER

This attribute contains the number of the post office box by means of which the user takes delivery of physical messages. The box is located at the post office that the MH_T_POSTAL_OFFICE_NAME attribute indicates. The attribute's values are defined by that post office.

· MH_T_POSTAL_OFFICE_NAME

This attribute contains the name of the municipality (for example, city or village) where the post office is situated through which the user takes delivery of physical messages.

· MH_T_POSTAL_OFFICE_NUMBER

This attribute contains the means of distinguishing among several post offices indicated by the MH_T_POSTAL_OFFICE_NAME attribute.

· MH_T_POSTAL_ORGANIZATION_NAME

This attribute contains the name of the organization through which the user takes delivery of physical messages.

· MH_T_POSTAL_PATRON_DETAILS

This attribute contains additional information (for example, the name of the organizational unit through which the user takes delivery of physical messages) necessary to identify the user for purposes of physical delivery.

· MH_T_POSTAL_PATRON_NAME

This attribute contains the name under which the user takes delivery of physical messages.

· MH_T_POSTAL_STREET_ADDRESS

This attribute contains the street address (for example, 43 Primrose Lane) at which the user takes delivery of physical messages.

· MH_T_PRESENTATION_ADDRESS

This attribute contains the presentation address of the user's terminal.

· MH_T_PRMD_NAME

This attribute contains the name of the user's PRMD. As a national matter, such names may be assigned by the country that the MH_T_COUNTRY_NAME attribute indicates or the ADMD that the MH_T_ADMD_NAME attribute indicates.

· MH_T_SURNAME

This attribute contains the user's surname; for example, Lee.

· MH_T_TERMINAL_IDENTIFIER

This attribute contains the terminal identifier of the user's terminal; for example, a Telex answer back or a Teletex terminal identifier.

· MH_T_TERMINAL_TYPE

This attribute contains the type of the user's terminal. Its value is selected from among the following:

- MH_TT_G3_FAX

- MH_TT_G4_FAX

- MH_TT_IA5_TERMINAL

- MH_TT_TELETEX

- MH_TT_TELEX

- MH_TT_VIDEOTEX

The meaning of each value is indicated by its name.

· MH_T_X121_ADDRESS

This attribute contains the network address of the user's terminal. Its values are defined by X.121.

Note: The strings admitted by X.121 include a telephone number preceded by the telephone escape digit (9), and a Telex number preceded by the Telex escape digit (8).

Certain attributes are grouped together for reference as follows:

· Personal Name Attributes

These comprise the following:

- MH_T_GIVEN_NAME

- MH_T_INITIALS

- MH_T_SURNAME

- MH_T_GENERATION

· Organizational Unit Name Attributes

These comprise the following:

- MH_T_ORGANIZATIONAL_UNIT_NAME_1

- MH_T_ORGANIZATIONAL_UNIT_NAME_2

- MH_T_ORGANIZATIONAL_UNIT_NAME_3

- MH_T_ORGANIZATIONAL_UNIT_NAME_4

· Network Address Attributes

These comprise the following:

- MH_T_ISDN_NUMBER

- MH_T_ISDN_SUBADDRESS

- MH_T_PRESENTATION_ADDRESS

- MH_T_X121_ADDRESS

For any i in the interval [1, 4], the domain type i and domain value i attributes constitute a domain-defined attribute (DDA).

Note: The widespread avoidance of DDAs produces more uniform and thus more user-friendly O/R addresses. However, it is anticipated that not all management domains (MDs) will be able to avoid such attributes immediately. The purpose of DDAs is to permit an MD to retain its existing native addressing conventions for a time. It is intended, however, that all MDs migrate away from the use of DDAs, and thus that DDAs are used only for an interim period.

An O/R address may take any of the forms summarized in the following table. the following table indicates the attributes that may be present in an O/R address of each form. It also indicates whether it is mandatory (M) or conditional (C) that they do so. When applied to a group of attributes (the network address attributes, for example), mandatory means that at least one member of the group must be present, while conditional means that no members of the group need necessarily be present.

The presence or absence in a particular O/R address of conditional attributes is determined as follows. If a user or DL is accessed through a PRMD, the ADMD that the MH_T_COUNTRY_NAME and MH_T_ADMD_NAME attributes indicate governs whether attributes used to route messages to the PRMD are present, but it imposes no other constraints on attributes. If a user or DL is not accessed through a PRMD, the same ADMD governs whether all conditional attributes, except those specific to postal O/R addresses, are present. All conditional attributes specific to postal O/R addresses are present or absent so as to satisfy the postal addressing requirements of the users they identify.

Forms of Originator/Recipient Address

Attribute | Mnem See Note 7 | Num See Note 8 | Spost See Note 9 | Upost See Note 10 | Term See Note 11
MH_T_ADMD_NAME | M | M | M | M | C
MH_T_COMMON_NAME | C | - | - | - | -
MH_T_COUNTRY_NAME | M | M | M | M | C
Domain-Defined Attributes | C | C | - | - | C
Network Address Attributes | - | - | - | - | M
MH_T_NUMERIC_USER_ IDENTIFIER | - | M | - | - | -
MH_T_ORGANIZATION_ NAME | C | - | - | - | -
Organizational Unit Name Attributes | C | - | - | - | -
Personal Name Attributes | C | - | - | - | -
MH_T_POSTAL_ ADDRESS_DETAILS | - | - | C | - | -
MH_T_POSTAL_ ADDRESS_IN_FULL | - | - | - | M | -
MH_T_POSTAL_CODE | - | - | M | M | -
MH_T_POSTAL_ COUNTRY_NAME | - | - | M | M | -
MH_T_POSTAL_ DELIVERY_POINT_ NAME | - | - | C | - | -
MH_T_POSTAL_DELIV_ SYSTEM_NAME | - | - | C | C | -
MH_T_POSTAL_ GENERAL_DELIV_ ADDR | - | - | C | - | -
MH_T_POSTAL_ LOCALE | - | - | C | - | -
MH_T_POSTAL_ OFFICE_BOX_ NUMBER | - | - | C | - | -
MH_T_POSTAL_ OFFICE_NAME | - | - | C | - | -
MH_T_POSTAL_ OFFICE_NUMBER | - | - | C | - | -
MH_T_POSTAL_ ORGANIZATION_ NAME | - | - | C | - | -
MH_T_POSTAL_ PATRON_DETAILS | - | - | C | - | -
MH_T_POSTAL_ PATRON_NAME | - | - | C | - | -
MH_T_POSTAL_STREET_ ADDRESS | - | - | C | - | -
MH_T_PRMD_NAME | C | C See Note 12 | C | C | C See Note 12
MH_T_TERMINAL_ IDENTIFIER | - | - | - | - | C
MH_T_TERMINAL_ TYPE | - | - | - | - | C

· Mnemonic O/R Address

This address mnemonically identifies a user or DL. Using the MH_T_ADMD_NAME and MH_T_COUNTRY_NAME attributes, it identifies an ADMD. Using the MH_T_COMMON_NAME attribute or the personal name attributes, the MH_T_ORGANIZATION_NAME attribute, the Organizational-Unit-Name attributes, the MH_T_PRMD_NAME attribute, or a combination of these, and optionally DDAs, it identifies a user or DL relative to the ADMD.

The personal name attributes identify a user or DL relative to the entity indicated by another attribute; for example, MH_T_ORGANIZATION_NAME. The MH_T_SURNAME attribute will be present if any of the other three personal name attributes are present.

· Numeric O/R Address

This address numerically identifies a user or DL. Using the MH_T_ADMD_NAME and MH_T_COUNTRY_NAME attributes, it identifies an ADMD. Using the MH_T_NUMERIC_USER_IDENTIFIER attribute and possibly the MH_T_PRMD_NAME attribute, it identifies the user or DL relative to the ADMD. Any DDAs provide information that is additional to that required to identify the user or DL.

· Postal O/R Address

This address identifies a user by means of its postal address. Two kinds of postal O/R address are distinguished, as follows:

Structured

Said of a postal O/R address that specifies a user's postal address by means of several attributes. The structure of the postal address is described in the following text in some detail.

Unstructured

Said of a postal O/R address that specifies a user's postal address in a single attribute. The structure of the postal address is left largely unspecified in the following text.

Whether structured or unstructured, a postal O/R address does the following. Using the MH_T_ADMD_NAME and MH_T_COUNTRY_NAME attributes, it identifies an ADMD. Using the MH_T_POSTAL_CODE and MH_T_POSTAL_COUNTRY_NAME attributes, it identifies the geographical region in which the user takes delivery of physical messages. Using the MH_T_POSTAL_DELIV_SYSTEM_NAME or MH_T_PRMD_NAME attribute or both, it also may identify the PDS by means of which the user is to be accessed.

An unstructured postal O/R address also includes the MH_T_POSTAL_ADDRESS_IN_FULL attribute. A structured postal O/R address also includes every other postal addressing attribute that the PDS requires to identify the postal patron.

Note: The total number of characters in the values of all attributes, except for MH_T_ADMD_NAME, MH_T_COUNTRY_NAME, and MH_T_POSTAL_DELIV_SYSTEM_NAME, in a postal O/R address should be small enough to permit their rendition in 6 lines of 30 characters, the size of a typical physical envelope window. The rendition algorithm, while defined by the physical delivery access unit (PDAU), is likely to include inserting delimiters (for example, spaces) between some attribute values.

· Terminal O/R Address

This address identifies a user by identifying the user's terminal using the network address attributes. It also may identify the ADMD through which the terminal is accessed by using the MH_T_ADMD_NAME and MH_T_COUNTRY_NAME attributes. The MH_T_PRMD_NAME attribute and any DDAs, which will be present only if the MH_T_ADMD_NAME and MH_T_COUNTRY_NAME attributes are present, provide information additional to that required to identify the user.

If the terminal is a Telematic terminal, it gives the terminal's network address and possibly, using the MH_T_TERMINAL_TYPE and MH_T_TERMINAL_IDENTIFIER attributes, its terminal type and identifier. If the terminal is a Telex terminal, it gives the terminal's Telex number.

Whenever two O/R addresses are compared for equality, the following differences are ignored:

· Whether an attribute has a value whose syntax is String(OM_S_PRINTABLE_STRING), a value whose syntax is String(OM_S_TELETEX_STRING), or both.

· Whether a letter in a value of an attribute not used in DDAs is an uppercase or lowercase letter.

· All leading, all trailing, and all but one consecutive embedded space in an attribute value.

Note: An MD may impose additional equivalence rules upon the O/R addresses it assigns to its own users and DLs. It may define, for example, rules concerning punctuation characters in attribute values, the case of letters in attribute values, or the relative order of DDAs.

As a national matter, MDs may impose additional rules regarding any attribute that may have a value whose syntax is String(OM_S_PRINTABLE_STRING), a value whose syntax is String(OM_S_TELETEX_STRING), or both. In particular, the rules for deriving from a Teletex string the equivalent printable string may be nationally prescribed.

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