true if the connection is the first connection in its session,false if not
@param initialPdu true if the key=value pair parameters have been sent in the first login{@link ProtocolDataUnit} from the initiator, false if thy have not
@param key the key part from the received key=value pair
@param values the value part from the received key=value pair
@param responseKeyValuePairs where the reply key=value pair will be added to if necessary
@return true if everything went fine, false if errors occured
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