To work successfully with Fax over IP (FoIP), the machine(s) running COPIAFACTS must each have a direct Internet connection with a fixed IP address.  Please check the following items:

1.  Fixed IP address

Your Internet Service Provider (ISP) must provide you with a fixed, unchanging IP address.  FoIP will not work with a dynamically allocated IP address.

2.  SIP Port 5060 must be open

Your firewall must not block port 5060.  Other ports used for SIP traffic may also need to be opened through your firewall. The ports to open depend on your CCR count set in OTFCONFIG.  For each count, you need 6 ports, starting from 49152; and then you need to add a further 300 ports to that figure.  So if CCR count is 100 you need to open ports 49152 to 50051 if they are currently blocked.  The range is shown in the hint text for the CCR count field in OTFCONFIG.

Use the SIP validator to check your connectivity.

3.  Remote access must work reliably

We have found that if our remote support program COPIATECH does not work responsively and reliably, neither will FoIP.

If you do not have a recent build of CopiaFacts installed (which includes COPIATECH), please download it from and try a connection to one of the Copia support staff.  Note that all links are case-sensitive.

Having COPIATECH working will also assist Copia to help you with your FoIP installation.

4.  Are you using NAT?

From BladeWare release 2.2.6, operation through Networt Address Translation is supported.  You can determine if NAT is in use by checking whether the address reported by IPCONFIG matches your externally visible IP address.  To do this:

in a command session (DOS box) run the IPCONFIG command:

in a browser, visit

If the IP Address shown by IPCONFIG does not match the External IP address shown in red, you are using NAT.  This affects the way you must set up BladeWare using OTFCONFIG.

5.  Multiple NIC cards need special configuration

If you have multiple network adapters (NIC cards), see the next topic which describes additional configuration requirements

6.  Bandwidth requirements and T.38

Unlike traditional digital telephone calls, which require a bandwidth of 56-64 kb/s per call, a typical FoIP call over a VoIP line in G.711 mode (alaw or mulaw) requires 80 to 100 kb/s bandwidth.  This leads to one of the principal advantages of using T.38 mode, which only requires 45 kb/s of your Internet connection.

T.38 mode is also highly recommended because it fixes many of the problems of using VoIP circuits for fax, such as packet delays, packets out of order, long faxes failing, and the ability to negotiate higher baud rates (above 14,400) while at the same time being unable to support such speeds after the call has been established.