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EAN0105-01
How survivability works
The EdgeMarc appliance automatically creates a local dialing plan by monitoring the registration
requests sent by LAN based SIP user agents as they register with the network based call
processing server. In creating this dial plan the EdgeMarc appliance now has knowledge of all local
SIP user agents installed on its LAN interface. This dial plan will be used during fallback mode of
operation when the EdgeMarc appliance provides local call switching between user agents and/or a
LAN side PSTN gateway.
EdgeMarc appliances continuously monitor the status of connectivity to network based call
processing servers using application layer heartbeat messages. Configuration settings in EdgeMarc
appliances control how often messages are sent to the call processing server and how quickly the
server will be declared unreachable in the event of a failure. The use of application layer messages
provides the added benefit of detecting the failure condition where an EdgeMarc appliance has IP
connectivity to the call processing server but the call processing server software itself is not
functioning properly.
Once a call processing server has been declared unreachable EdgeMarc appliances enter fallback
mode and perform call processing for local SIP user agents. A SIP PSTN gateway can also be
installed at the branch office on the LAN side of the EdgeMarc appliance and used for inbound and
outbound calling during fallback mode. To maximize utilization of this gateway it can also be used
when call switching is being performed by the network based call processing server.
Once connectivity to the network based call processing server is restored the EdgeMarc appliance
will automatically turn control of all subsequent call requests over to the softswitch. Calls in
progress that were established while the EdgeMarc appliance was in fallback mode will not be
disrupted when connectivity is restored to the network based call processing server.
Redundant or multiple call processing servers can be used in conjunction with EdgeMarc Series
appliances to further enhance the availability of voice services. EdgeMarc appliances will use DNS
SRV records from a DNS server to obtain a prioritized list of available network based call
processing servers. The EdgeMarc appliance using periodic messages monitors each server and
the highest priority server that is currently reachable will be used for call processing. This feature
can also be used to load balance or distribute calls among multiple servers however state
replication is required by the call processing servers to provide full redundancy.
Platform support
EdgeMarc Converged Network Appliances
• 4200 Series
• 4300T Series
• 5300 Series
• 6400 Series
IP Phones
• Polycom IP500 & IP600
• Cisco
PSTN Gateways
• Audiocodes MP-104/108
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