Microsoft KB Archive/86977

= X400: Definition of X.121 Address =

Article ID: 86977

Article Last Modified on 10/30/2006

-

APPLIES TO


 * Microsoft Mail Gateway to X.400 3.0

-



This article was previously published under Q86977



SUMMARY
The X.121 is an address that enables packets to be sent to people on a public data network. The X.25 network uses X.121 addresses to determine routing within the X.25 network.

The X.121 address can be equated to a voice phone number on a telephone network.

The X.121 address length for an international data number is a 10-digit numeric character set from 0 to 9. The number formats for various data accesses are as follows:

International data number:

P + DNIC + NTN

Or, if the number is part of a national integrated numbering scheme:

P + DCC + National Number

Public telephone network:

P + 9 + TCC + National Significant Telephone Number

Public Telex network

P + 8 + TDC + National Telex Number

Here are descriptions of the acronyms used above:   Acronym   Description ---  ---

DCC      Data country code (3 digits) DNIC     Data network identification code (4 digits) NTN      Network terminal number)   P         International prefix   TCC       Telephone country code   TDC       Telex destination code For more information, refer to CCITT Recommendation X.121 Fascicle VIII.4.

Additional query words: pcmail

Keywords: KB86977

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.