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| Verbindungsunterstützungssystem n (DTAG, VASs) | |||
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| Verbindungsunterstützungssystem n (DTAG, ITU-T (CCITT) Rec. X.400, supports telex, teletex, TELEBOX & vtx E-mail, packet-switched VASs) | |||
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interconnection support system : 2 phrases in 1 subject |
| Communications | 2 |