A method for encoding a SID frame for a transmission of background noise information by using a scalable speech signal coding method with the following steps: Encoding a narrowband first portion and a broadband second portion of the background noise information; forming the SID frame with separated domains for the first and the second portion; providing the scalability for the analogous transmission of speech information when forming the SID frame, such that it is determined on the receiver side whether a comfort noise is based on the broadband second portion of the transmitted SID frame or based on the narrowband first portion, wherein, when broadband speech information is transmitted, the comfort noise is based on the broadband second portion of the transmitted SID frame and when narrowband speech information is transmitted, the comfort noise is based on the narrowband first portion of the transmitted SID frame; wherein a narrowband third portion is encoded and the SID frame is formed with an additional separated domain for the third portion; wherein the narrowband third portion is rendered in an enhanced quality compared to the narrowband first portion due to an increased data rate of the encoding of temporal and spectral parameters of the background noise and in conformity with standard G.729.B; wherein the first portion of the background noise information is encoded according to coding guidelines of standard G.729.B; characterized in that the second portion of the background noise information is encoded according to a modified TDBWE method, wherein a simplification of the modified TDBWE method is achieved in that an encoding in the time domain only corresponds with the energy of the signal in the time domain. Encoding a narrowband first portion and a broadband second portion of the background noise information; forming the SID frame with separated domains for the first and the second portion; providing the scalability for the analogous transmission of speech information when forming the SID frame, such that it is determined on the receiver side whether a comfort noise is based on the broadband second portion of the transmitted SID frame or based on the narrowband first portion, wherein, when broadband speech information is transmitted, the comfort noise is based on the broadband second portion of the transmitted SID frame and when narrowband speech information is transmitted, the comfort noise is based on the narrowband first portion of the transmitted SID frame; wherein a narrowband third portion is encoded and the SID frame is formed with an additional separated domain for the third portion; wherein the narrowband third portion is rendered in an enhanced quality compared to the narrowband first portion due to an increased data rate of the encoding of temporal and spectral parameters of the background noise and in conformity with standard G.729.B; wherein the first portion of the background noise information is encoded according to coding guidelines of standard G.729.B; characterized in that the second portion of the background noise information is encoded according to a modified TDBWE method, wherein a simplification of the modified TDBWE method is achieved in that an encoding in the time domain only corresponds with the energy of the signal in the time domain.