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How a FoIP System Works
Home » Business Communications » FOIP and Emailed Faxes » How a FoIP System WorksFoIP occurs in five phases. Each phase as to the next phase until the end result is accomplished: a completed fax. These five phases include:
• Call establishment: The person who wishes to send the fax, does it either manually, or has it set up to do so automatically. If the person does it manually, he has to set up the software so it dials the fax number. Then the call is placed. When a connection is established, the receiving fax machine returns a signal referred to as a CallEd station Identification (CED). This is the high-pitched tone you hear through your speaker. By hearing this tone, you will know if your connection was made. If you don't hear this tone, you may hear a busy signal or a regular dial tone. If this happens the receiving fax machine may not be engaged.
• Control exchange: After a connection is made the software communicates with the receiving machine to determine what speed to send the fax, and whether or not the line is clear to send the fax. If all is a go, the software takes the document you created, converts it to be read by the fax machine software.
• Information transfer: After the document has been converted over, the software now sends the page or pages over the network to the receiving fax machine.
• End-of-page warning: Besides sending the documents to the receiving fax, a special signal is also sent to the receiving fax when no more documents are in the queue to be sent. This is known as an end-of-page warning or signal. If there are multiple pages to go through, this signal is not sent; instead it sends a signal to let the receiving fax machine know that more pages are coming. This is known as a multipage signal (MPS). The receiving machine sends a signal or message confirmation signal (MCF) to let the sending software know to continue sending more documents.
• Call release: It is at this stage that the call has been completed. When all documents have been faxed over, the sending software sends a disconnect message (DCN) to let the receiving machine know to end the call. At this point the receiving machine hangs up and the call ends.
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