A Fax Overflow mailbox can print incoming faxes in a different order than they are received.
For example: While Fax A is received by fax machine, Fax B arrives and is handled by the Fax Overflow mailbox. While fax B is received, Fax C arrives, and is handled directly by fax machine, which has now finished with A. On retry, the Fax Overflow mailbox connects with the fax machine and B is delivered. The faxes arrive as ABC but are printed as ACB.
A fax can be delayed indefinitely if it encounters a busy fax machine on every delivery attempt. To reduce fax delays, set the retries to be frequent and numerous. We recommend the default of 99 retries, with a 1 minute interval.
When the Fax Overflow mailbox connects with the target fax machine, it delivers as many of the stored fax messages from its queue as possible. This can cause a potentially long connect time. Any new fax calls that arrive while the fax machine is engaged by the Fax Overflow mailbox go to the Fax Overflow mailbox. If many faxes arrive, faxes are printed as fast as they arrive, but use an average of two fax ports as they are buffered through the Fax Overflow mailbox.
A Fax Overflow mailbox can temporarily accept more traffic than the target fax machine can handle. Thus traffic spikes are spread out over time.