FaxBack Port Server - Manual - Manual (Page 6)

Scalability & Reliability
By default, the Connection Server will load‐balance amongst the configured Port Servers. Port Servers can also be
brought on‐line and dynamically added to routing groups in case of failure.
Both Connection Servers and Port Servers can be disabled for maintenance without disrupting connected clients or
their faxes. While disabled, that particular server will refuse any new faxes, and any logged in clients will be
migrated to another Connection Server. Any faxes in progress when the server is disabled will finish without
interruption, but new faxes will be routed to alternate servers, if available.
Infrastructure Requirements
IIS / SQL Server
Any version of IIS that supports ASP.NET 2.0 is sufficient to run the HTTPS Proxy.
A Microsoft SQL Server version 2000 or above is required for the Port Server and Billing databases. For smaller
installations, MSDE or SQL Server Express versions are sufficient.
SIP+T.38 media gateway
The Port Server must be connected to media gateways that support SIP and T.38. For outbound faxes, the media
gateway must re‐INVITE for T.38 if a fax is detected. For inbound faxes, the Port Server will immediately re‐INVITE
for T.38.
Each Port Server can be configured to use a SIP proxy instead using a per‐Port Server user name and password.
Each Port Server can be configured to send REGISTER requests to a SIP registrar.
Media gateways that are known to work include (but are not limited to):
• AudioCodes TrunkPack and Mediant series
• Most Cisco routers
T.38 traffic is expected to consume approximately 60kbps per active fax port.
Upstream SIP Trunking Provider
A Port Server can be configured to use an upstream SIP trunking provider instead of a media gateway. Insure that
the upstream provider supports end‐to‐end T.38 for reliable faxing. It is also important to have a low‐latency link
(less than 50ms round‐trip) to the provider.
LAN / WAN topology
At this time, only IPv4 networks are supported.
HTTPS traffic is expected consume approximately 15kbps per active fax port.