One of the most prominent Media server features is to provide tones for Telephony Control Server when required. Tones are country-specific; in each country individual requirements on tone frequency, tone duration and pause intervals between the single tone sections apply for tones.
Each tone is realized by a sound file. In such a file, several tone frequencies of different playback length can be combined with specific pause intervals.
Depending on the signaling exchanged between the Media Server and the following instances, a large number of tones can be played:
The Media server plays simple telephone tones when the signaling indicates that this is not possible at the endpoint. Examples of such tones are ringback tone, dial tone, busy tone and call-waiting tone.
The Media Server plays network tones when the signaling indicates that this is not possible at the remote gateway. An example is here the network busy tone, which indicates that calls can currently not be made via the network.
Furthermore, the Media Server is always in charge of playing specific tones – for example:
An EG-internal busy tone is played under specific error conditions – for example, when the subscriber dials an invalid destination.Parent topic: Media Services
When a person joins or leaves a conference, a zip tone is played.
The Telephony Control Server system is released for various countries. Consequently, it supports the country-specific tones for each released country.