SourceCode from the Demo ?

In the Sourcecode from the delphi demo (GSMCenter) in line 1142:

TSMSProtocol2(NBS).SourceAddress:= TSMSProtocol2(NBS).DestinationAddress;

what dose it mean ?

Read EMS definition

What does mean "what"? Study how EMS is defined, i.e. read standard. Then you'll see what is SourceAddress and DestinationAddress.

maybe you can help me, that

maybe you can help me, that dose it mean ? i do not understand what the adresses means ?

source and destination are opposite ? how can read this ?

Study standards

GSM 03.40 and 03.41 standards.