In this redundancy option, one Media server is assigned to each Telephony Control Server cluster node. Each of the two Media servers acts as backup for the other one.
The following figure shows the Media server redundancy in the 1+1 configuration with Telephony Control Server cluster nodes at the same branch.
The Media servers are found at the same branch as the Telephony Control Server cluster nodes. The primary Media server is operable and handles the entire Media server traffic of Telephony Control Server.
The following figure shows a comparable redundancy with geographically separated Telephony Control Server cluster nodes.
The Media servers are usually found at the same branch as the Telephony Control Server cluster nodes. In normal operation one of the following configurations is possible:
The Media server of branch A is operable and handles the entire Media server traffic of Telephony Control Server. The Media server of branch B serves as backup.
At both branches the Media servers are primary ones, serving as backup for each other. This option enables the load balancing, since the subscriber load can be distributed among the two Media servers.
In case of a failure and depending on the failure type, the following happens:
If an Telephony Control Server node fails, the other one takes over. The MGCP signaling manager of the partner node still uses the same Media server as before the node failure.
Media Server Failure
If the primary Media server fails, Telephony Control Server switches new Media server traffic to the backup Media server automatically. Existing connections to the failed Media server are not switched over and drop away.
Failure of a Branch or Building
If branch A fails completely, the Telephony Control Server partner node registers this event and uses the Media server of branch B from then on.
Support of Several Languages
Both Media servers must be configured for all required languages.
Parent topic: Media Server Redundancy on Telephony Control Server