2N Omega series - Configuration Tool manual v1.10 - Manual (Page 112)

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If you used manual connection, you will be invited to dial the telephone
number manually.
2.15.12. Cancelling Connection
To cancel the established connection press the bar button CANCEL MODEM
CONNECTION WITH PBX (cross in a red field). By pressing this button you cancel
the connection and selection of the PBX in the programming tool.