Hardware Description and Reference for Avaya ... - Avaya Support

S8700-series Media Server as an Enterprise Survivable Server
Avaya S8700-series Media Servers
A Communication Manager configuration may use the S8700-series Media Server as an
Enterprise Survivable Server (ESS). The ESS option provides survivability to a configuration by
allowing backup servers to be placed in various locations in the customer’s network. An ESS
assumes call processing control of all or part of the configuration in case the main server,
another S8700-series Media Server, fails or network connections to the main server fail.
A main server may have many, up to 63, ESSs available to provide backup service. The
placement of the ESS or ESSs in the configuration is typically targeted at ensuring that port
networks that are configured in different segments of the customer’s LAN/WAN can receive
service even when LAN/WAN connections are lost.
Once the communication failure to the main server has been corrected, control of call
processing may be returned from the ESS to the main server either manually port network by
port network or automatically for all port networks at once.
Note: In
Note:
the transition of control from the main server to an ESS, all calls are dropped
while the media gateways carrying the calls reset to connect to the ESS.
Servers, port networks, and gateways that an S8700-series ESS supports
An S8700-series Media Server may serve as the ESS for an S8700-series main server only. If
the main server is a S8500 Media Server, any and all ESS servers in the configuration must
also be S8500 Media Servers. If the main server is an S8700-series Media Server with a
duplicated control network and duplicated bearer network, the S8700 ESS can maintain the
duplication when it takes call processing control from the main server.
Note:
Note: An ESS may support a G150, G250, G350, or G700 Media Gateway through the
C-LAN connection of the ESS-connected port network.
An ESS can support CSS-connected or ATM-connected port networks, as well as IP-PNC port
networks, in the main server’s configuration. However, the ESS normally uses the customer
LAN, and therefore IP-PNC port network connectivity, to provide both backup control and bearer
traffic when the main server connection is lost.
Requirements to support CSS- and ATM-connected port networks
Each CSS-connected port network that is to receive ESS service must also contain a
TN2312BP IPSI circuit pack and TN570 Expansion Interface circuit packs with vintage D or
higher. Vintage D of the TN570 allows the TN570 to appropriately share control from the server
with the IPSI. To be survivable, any CSS-connected port networks must have an IPSI to get
service from an ESS and a TN2302AP IP Media Processor or a TN2602AP IP Media Resource
320 to have port network connectivity to the other PNs. A PN without an IPSI will lose service
when the main server connection fails.
Each ATM-connect port network that is to receive ESS service must also contain TN2305 or
TN2306 ATM Interface circuit packs with vintage B or higher. Vintage B of the TN2305/2306
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