The Telephony Control Server media services are provided by at least one independent Media server. The functions of this Media Server are controlled by Telephony Control Server via the Media Gateway Control Protocol (MGCP).
The Media Server respectively used provides Telephony Control Server with the following general media services:
In this media service context the following general features or technologies are also supported:
Mixing of media streams for conference applications
Creation of DTMF tones to support CSTA-compatible applications of Telephony Control Server.
Inband recognition of DTMF tones
Support of the following audio codecs:
- G.711 A-Law
- G.711 µ-law
Universal allocation of protocol ports for playing tones / system announcements / greetings and for conferences.
Supported Media Servers
Telephony Control Server can be operated with different selected Media server products.
Media Server Farm
If the performance data of a single Media server do not comply with the desired performance or redundancy requirements, you can also connect a Media server farm with several parallel Media servers to an Telephony Control Server system. In this case, the Telephony Control Server system distributes the load among the various Media servers.
Media Server Redundancy on Telephony Control Server
Telephony Control Server supports various redundancy options for connecting Media servers. In this support, any combination of RadiSys and Media Server can be used.
Media Server Deployment Scenarios at Telephony Control Server
Telephony Control Server supports different alternatives for connecting Media servers. The defined, general routing mechanisms of the Telephony Control Server system determine the Media server that Telephony Control Server supports in the respective situation.
Configuration Concept of the Media Server
The configuration concept of the Media Server is based on the configuration of the following areas: configuration of the provider modules, configuration of the address bindings, system resource management.
Expert Settings of the Media Server
Besides the Media Server settings, which you can configure in the Common Management Portal, there are more expert settings for various Media Server providers. These expert settings are administered in the configuration file of the relevant provider.
Tones for Telephony Control Server
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.
System Announcements for Telephony Control Server
One of the most prominent Media server features is to provide system announcements for Telephony Control Server when required. Every system announcement exists for all languages that Telephony Control Server supports. The system announcements can thus be used for each country in which one of the supported language is spoken.
Music-on-Hold (Telephony Control Server-based)
The Telephony Control Server-based feature music-on-hold enables callers to hear music while their call is being held. The feature can be directly assigned to a subscriber or be integrated in a feature profile that is directly assigned to the subscriber. In case of a collective line the trigger number of the collective line is regarded as subscriber. If the music-on-hold feature has been configured, a subscriber always hears music while being held in waiting state. This applies to: making a consultation call, holding an active call, manually holding an active call and CSTA-initiated hold.
Telephony Control Server support different types of conferences: Station-controlled conferences (large conference), meet-me conferences and ad hoc conferences.
System Announcements and User Greetings for Telephony Application Server
The Media Server provides the conference and voice portal of Telephony Application Server. In this scope the Media Server manages the system announcements and user greetings of these portals. The system announcements are the same for all Lotus Sametime Unified Telephony users. The user greetings can be customized by each Lotus Sametime Unified Telephony user and define welcome greetings and name greetings.
System Resources Management
You can use the system resource management of the Media Server to proportionately assign operation-critical system resources to individual media applications of the Media Server – e. g. to the conference portal user access. In this way it is possible to split up the operation-critical system resources according to their use and to guarantee each media application a specific number of operation-critical system resources.
Connection of the Media Server to Several SIP Servers
If you use Telephony Application Server, the Media Server is connected to the Telephony Control Server system via an SIP trunk. In this way it can accept incoming connection requests or set up outgoing ones. So that communication is still possible even if the connected Telephony Control Server system or the connection to the system fail, the Media Server can be connected to different Telephony Control Server systems.
Media Applications of the Media Server
The Media Server can execute different internal media applications to provide the user with extended media services. These media applications are configured via the Media Server settings.
Transfer Conference of the Media Server
From an existing telephone connection with two subscribers a conference is often to be established. The transfer conference does not realize such a conference device-controlled but via the conference portal of Telephony Application Server.
Connection of Telephony Application Server and Xpressions
You can connect Telephony Application Server to Xpressions. Such a connection extends the Unified Messaging features of the PhoneMail application of Xpressions by the Unified Communications features of Telephony Application Server.
RTP System Parameters for Media Services
The general behavior of the Telephony Control Server media services are influenced by system-wide settings – by so-called Resilient Telco Platform system parameters (RTP system parameters).