User manual

4300T User Manual Edgewater Networks, Inc.
Version 1.7 46
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.