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44 • Confi guration
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4.6 Outbound Proxy List
In addition to the previously mentioned outbound proxy you may
specify a number of dedicated outbound proxies. This feature is typically
being used in the following scenarios:
• Integration of PSTN gateway. If you set the outbound proxy of the
PSTN gateway to the filter, it can easily redirect all requests to the
proxy. However, when the proxy wants to route a call back through
the filter, it must know that the request must be routed to the PSTN
gateway. If you set up a DNS name for the PSTN gateway and set
the destination to the filter, you can elegantly redirect all outgoing
calls to the PSTN gateway trough the filter first. BTW the filter can
then take care of such problems as UDP fragmentation and multiple
2xx responses.
• Replace PSTN gateway with other gateways, for example ITSP
service or IP gateways.
• Multiple-Domain hosting: If you are using several proxies for differ-
ent domains, the filter can redirect the requests to the right proxy
automatically. This approach is limited to a maximum of ten do-
mains per filter; for additional domains you need to use the web
server integration mentioned above.
4.