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Step 4 - Configure the IP address of the local LAN side PSTN gateway (optional)
This step should be used if you have installed a PSTN gateway
at the branch office location. In this case the IP address of the
LAN side PSTN gateway must be configured in the EdgeMarc
appliance to support inbound and outbound PSTN calling while
in fallback mode of operation. This gateway resource may also
be used by network based call processing servers when the
WAN link is operational. In fallback mode when the call
processing server cannot be reached the EdgeMarc appliance
will route outbound calls to the LAN side PSTN gateway if a
number is dialed that is not stored in its local dial plan (e.g. a
local SIP user agent).
A. Log into the EdgeMarc appliance using a Netscape or
Internet Explorer web browser.
B. Select System.
C. Select Survivability.
D. Press Submit.
Step 5 - Configure call processing server redundancy
If you will be using multiple network based call processing servers then you will need to enable
server redundancy and specify the time between DNS lookups in the EdgeMarc appliance. Enabling
redundancy allows a DNS server to provide a list of multiple call processing servers to the
EdgeMarc appliance in the answers to SRV lookups. Each server in the list will be monitored using
periodic messages by the EdgeMarc appliance and the highest priority server that is currently
reachable will be used for signaling. The EdgeMarc appliance uses the reachability settings
described in step 2 to determine the status of remote servers and remove inoperable servers from
the list.
Triggers can also be used by the EdgeMarc appliance to determine when to forward call requests to
a secondary server in the list. A trigger is set when a configured number of resends are received by
the EdgeMarc appliance from a SIP user agent attempting to place a call. When initiating a call a
SIP user agent will send an INVITE message to the EdgeMarc appliance that will then be forwarded
to the primary server. In the event that the primary server fails before a reachability alarm has
been declared using the heartbeat messages the user agent will resend INVITE messages until the
trigger condition is met. At this point the EdgeMarc appliance will forward the call request on to
the secondary server in the list. Please use the following steps to enable redundancy and set
triggers:
A. Log into the EdgeMarc appliance using a Netscape or
Internet Explorer web browser.
B. Select System.
C. Select Survivability.
D. Enter the Time between DNS lookups (in seconds) in
the Softswitch Reachability section of the web page.
E. Select Enable SIP server redundancy in the
Softswitch Redundancy Settings section of the web
page.
F. Select Trigger on resends in the Softswitch
Redundancy Settings section of the web page.
G. Enter the Number of resends to declare alarm.
H. Press Submit.
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