High Availability
In the deployment of VoIP network, New Rock MX-Series VoIP Gateway (referred as gateway below) supports high availability architecture with Primary-Standby, Active-Standby and Load balancing mode.

Primary-Standby mode

In this mode, a backup SIP proxy server (referred as SIP server) is configured. The gateway will failover to the backup server automatically when the primary server faults. The gateway detects the failure condition of primary server by sending OPTIONS request to it. If the gateway does not receive the response to OPTIONS request, it will failover to the backup server.
After failover to the backup server, the gateway will still send OPTIONS to the primary server all the time. It switches back to the primary server once the response to the OPTIONS request is received.

Active-Standby mode

In this mode, one SIP proxy server (referred as SIP server) functions as the primary server while other SIP servers function as standby servers.
Either of the following conditions could trigger the failover operation of the gateway:
-  Not receiving response to the OPTIONS message from the current SIP server to which the gateway sends or receives call traffic; 
-  Not receiving response to the REGISTER/INVITE message from the current SIP server to which the gateway send or receives call traffic
The administrator can manually switchover the gateway from the current SIP server to the next available one. 
The gateway will redirect call traffic to the designated proxy server in responding to the re-INVITE from the server.

Load balancing mode

In this mode, the clustered SIP servers are all working in active status. Under the coarse grained scheme all endpoints of a gateway are allowed to register on one of the designated servers and under the fine grained scheme the endpoints of a gateway are allowed to register on multiple servers, according to the administrator’s load balancing plan. The following features are supported with load balancing:
-  The gateway as a whole or endpoints search for the designated sever in the server cluster (a list of servers) using REGISTER/INVITE message in forward circular scheme.
-  Server failure detetion is supported by gateway sending OPTIONS to each servers, on which the gateway or endpoints are registered on.
-  Upon the condition of no response to OPTIONS or REGISTER/INVITE, the gateway will search for the next available servers for the gateway or endpoints and move the calls to them accordingly
The gateway will redirect call traffic to the designated proxy server in responding to the re-INVITE from the server.
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