Every software program has its advantages and disadvantages. This happens no matter what program it is and how it is used. This is no different for FoIP and emailed faxes. The major issues for FoIP are:
• Timing: Timing is a major problem for FoIP. This is because when faxes are sent over the Internet or network, sometimes the relayed packets are delayed and bottlenecks can occur. This can cause the signal be either delayed and the call drop, or the information coming through the receiving machine could be garbled or misfed. In other words, instead of getting page one first, the receiving machine could get page two followed by page three, with page one following. The sending software has to be programmed to allow for this and adjust the sending of the packets when the network congestion appears.
• Jitter: This occurs when many packets are sent in a variable sequence instead of sending them one after another. Another way to explain this is if 10 packets were sent by the sending software, if the software program was not set up to handle communication problems on the network, those ten packets would be sent randomly instead of in a serial format. To avoid this a timing setting or function would have to be set up in the software to hold sending the packets until such a signal is received, informing the software to send the next packet.
• Lost packets: If the network has severe congestion or network relay problems, a packet could eventually drop. This would mean a bit of information would not make it to the receiving machine. To avoid this from happening, fax software can be programmed to repeat the last packet sent so it goes through. When the receiving machine receives one packet but there is a long delay in getting the next packet or signal that lets the machine know more is coming, that machine could send a request for the next packet to be sent back. This way the software would know the packet was dropped and would resend it.
Overall, although there are some concerns with using FoIP and email faxes, the technology used is always being updated and improved upon. The main result of using FoIP is a cost savings to both parties involved because of lower bandwidth usage.