Abstract: The present invention relates to a method and apparatus for modification of a connection between a transmitting subscriber and a receiving subscriber in a communications system, which is based on data compression, within a switching center, with a data frame which arrives in the switching center and is formatted on the basis of a framing protocol being replaced independently of the length of the data frame by a new data frame formatted on the basis of the framing protocol, such that additional information can be fed into the connection without any loss of quality or time.

Abstract: Efficient adjustment of tones and announcements are equalized in the conversation of a mobile radio telephone subscriber by a common air interface (4) enabling an exchange to occur between several transmission modes characterized by different compression of said conversation. This is achieved by means of a device and a method for adjusting an acoustic sequence (11; 12; 13; 14; 15; 16; 17; 18) in the speech channel of a common air interface (4) for a subscriber (2) of a mobile radio telephone network (4, 3, 5). According to the invention, a transmission mode (A; B; C) which is to be used on the speech channel can be selected (3,5) from several transmission modes defined by differing degrees of compression of speech sequences (8) of the subscriber (2) on the common air interface. An adjustable acoustic sequence is stored in several compression data sets (11, 12, 13, 14, 15, 16, 17, 18) whose compression respectively corresponds to the compression of at least one of the transmission modes (A; B; C:).

Abstract: The present invention relates to a method and apparatus for modification of a connection between a transmitting subscriber and a receiving subscriber in a communications system, which is based on data compression, within a switching center, with a data frame which arrives in the switching center and is formatted on the basis of a framing protocol being replaced independently of the length of the data frame by a new data frame formatted on the basis of the framing protocol, such that additional information can be fed into the connection without any loss of quality or time.