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S |
Old Code |
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AA |
= |
Circuit switching |
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A process that, on demand, connects two or more data terminal equipments and permits the exclusive use of a data circuit between them until the connection is released (ISO). |
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+ |
EI |
= |
EDI transmission |
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Number identifying the service and service user. |
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+ |
MA |
= |
Mail |
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Postal service document delivery. |
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TE |
= |
Telephone |
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Voice/data transmission by telephone. |
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