1. A method for providing a comfort noise in a communication network, comprising: monitoring via a border element or via a speech activity detector attached to the border element speech activities in a call media path; monitoring via the border element or via the speech activity detector attached to the border element a background noise level or a telephone line noise level in the call media path; and introducing via the border element or via the speech activity detector attached to the border element dynamically a comfort noise if an absence of speech period is detected on the call media path and the background noise level or the line noise level is below a predefined noise threshold, wherein the introducing comprises: replacing the background noise or the telephone line noise with the comfort noise during the absence of speech period if the background noise or the telephone line noise level is below the predefined noise threshold; and transmitting the background noise or the telephone line noise without introducing the comfort noise during the absence of speech period if the background noise or the telephone line noise level exceeds the predefined noise threshold.