Using Fax Timeouts options allows the Fax Voip FSP to forcibly terminate the VoIP phone call and free up fax resources (Fax Voip Line virtual devices).

In a normal scenario, Fax Voip FSP automatically ends the call after successful transmission or reception of a fax, as well as in case of receiving final statistics on unsuccessful transmission or reception of a fax from the fax module. The call also ends (and the fax resources are released) when the remote party hangs up. Correct call termination is also provided by a set of internal timeouts in the low-level Fax Voip FSP codes. In practice, due to various reasons (the remote party did not hang up, errors in SIP signaling), it is rare, but possible situations when the call does not end within a reasonable time. Using the Fax Timeouts options below guarantees the call termination in any case and helps to avoid stuck calls.

Fax Transmission (Outgoing Calls)

The timeout options below are applied to the outgoing faxes:

Wait for call answer no more than ... seconds

Specifies how long Fax Voip FSP should wait for call answer before timing out. Default timeout: 90 seconds. Can vary from 10 to 180 seconds. Note that telephone system usually terminates a call if it is not answered within 60-90 seconds.

Time to establish connection with a fax, no more than ... seconds

The maximum time to wait for the start of fax transmission. Time reckoning starts with the remote party answer detection and ends when the first page of the fax begins to be transmitted. Default timeout: 90 seconds. Can vary from 10 to 180 seconds.

Transmit each fax page no more than ... minutes

The maximum transmission time for one page of a fax. Default timeout: 15 minutes. Can vary from 5 to 90 minutes. Note that the actual transmission time of fax page depends on many factors: page content, fax bitrate, using of Error Correction Mode (ECM) etc.

Maximum outgoing call duration ... minutes

The maximum duration of an outgoing call. Default timeout: 60 minutes. Can vary from 5 to 90 minutes. Note that many telephone service providers forcibly terminate any call after 30-90 minutes.

Fax Reception (Incoming Calls)

The timeout options below are applied to the incoming faxes:

Time to establish connection with a fax, no more than ... seconds

The maximum time to wait for the start of fax reception. Time reckoning starts when an incoming call is answered and ends when the first page of the fax begins to be received. Default timeout: 90 seconds. Can vary from 10 to 180 seconds.

Receive each fax page no more than ... minutes

The maximum time to receive one page of a fax. Default timeout: 15 minutes. Can vary from 5 to 90 minutes. Note that the actual transmission time of fax page depends on many factors: page content, fax bitrate, using of Error Correction Mode (ECM) etc.

Maximum incoming call duration ... minutes

The maximum duration of an incoming call. Default timeout: 60 minutes. Can vary from 5 to 90 minutes. Note that many telephone service providers forcibly terminate any call after 30-90 minutes.