Fax Delivery Status

Listed below you will find details on the most common outbound fax delivery errors, their typical causes, and where applicable, suggested resolutions. Note that by the time the FaxLogic system reports a delivery error, it has already taken all available automated actions to compensate for the underlying issue, and where appropriate, has already made several attempts to connect with and deliver the fax to the recipient.



If you have tried the suggested resolution and are still having problems, or the status returned is not one of those listed below, please open a Support Ticket for further assistance.

Number Problems

Invalid Number

The number originally supplied for the recipient is invalid and can not be dialed. This could be a missing digit (i.e. 9 digits of a 10-digit number), transposed digits that make the number invalid (i.e. a non-existent country or area code), or a simple mis-dial resulting in a number that can not exist within the destination country's dialing plan. Please double-check the number with the recipient, and especially for calls to international numbers, verify that you are including the necessary area or city codes.

Restricted Number

The number originally supplied for the recipient is valid but restricted. This could include numbers that start with special or emergency service codes, pay-per-call numbers, or numbers to countries that are restricted on your account. Please double-check the number with the recipient. If you are trying to make an international call to a country that you do not call often, it may be restricted on your account in order to prevent toll fraud; please open a Support Ticket to request that this restriction be lifted.

Unreachable Number

The number originally supplied for the recipient is thought to be valid but the network is rejecting the call. This is usually a "wrong number" or an international call with missing or invalid area or city codes. Please double-check the number with the recipient.

Unable to Connect

No Answer

The called number is ringing, but does not answer after 60 seconds (approximately 10 rings). This could be a "wrong number", but if you have verified the number with the recipient, it is likely that the receiving equipment (i.e. fax machine or server) is off-line or disconnected.

Line Busy

The called number is otherwise valid, but is returning a busy signal. This could be a "wrong number", but if you have verified the number with the recipient, it is most likely that the receiving equipment (i.e. fax machine or server) is busy with another call or is unable to receive your fax because it is out of supplies (i.e. paper, ink, toner, memory). Please contact the recipient and have them verify that their equipment is ready to receive your fax, then try sending again.

Network Busy

The number originally supplied for the recipient is thought to be valid but the network is unable to complete the call. This is often a "wrong number" or an international call with missing or invalid area or city codes. Please double-check the number with the recipient. If the number is valid, it is possible that a temporary network issue is preventing the call from getting through (i.e. like making a call and getting an "all circuits are busy now" recording); if so, try your call again after a short wait.

Not Reaching a Fax

No Carrier

The call was connected and something answered, but there was no modem carrier tone (the high-pitched tone you hear at the beginning of a fax call). This is usually a "wrong number" (i.e. the supplied number was the recipient's main number or voice mail, instead of their fax number). In rare cases, it may actually be a fax answering, but we are unable to recognize it due to very poor line quality, severe line noise, or other such issues. Please double-check the number with the recipient.

No Fax Answer

The call was connected and was answered by a modem carrier tone (the high-pitched tone you hear at the beginning of a fax call), but whatever answered did not behave like a fax machine or server. It may be a non-fax modem device, like a computer, a postage meter, or an alarm system. And in rare cases, it may actually be a fax answering, but we are unable to recognize it due to very poor line quality, severe line noise, or other such issues. Please double-check the number with the recipient.

Transmission Issues

Protocol Error

The call was connected and a fax was detected on the receiving end; we started negotiating with the fax for a suitable speed and protocol but were not able to find any that would work with the line conditions observed on this call. In most cases, this happens before any portion of the fax is transmitted, but it can also happen in the middle of the fax if the line conditions change during the call. In many cases, retrying will resolve the issue, because the FaxLogic system learns from prior calls and will make additional adjustments on later calls to the same number. If you see this error frequently to a particular number, please open a Support Ticket to report it; in many cases, additional manual adjustments can be made to further compensate for the underlying problem.

Partial Transmission

The call was connected and at least a portion of the fax was successfully transmitted. In fact, all of the fax may have been transmitted. In order for FaxLogic to report a fax as successful, we must receive the final signal from the receiving equipment that confirms it has received everything we sent. Some equipment does not send that final signal, so even if the entire fax was received successfully, we will still report it as a partial transmission, simply because we can not be certain. Of course in some cases, this error means exactly what it says, that only a portion of the fax was actually received. This can be due to the receiving equipment running out of supplies (i.e. paper, toner, ink, memory) in the middle of the transmission, especially if the fax being sent is very long. It can also be caused by network issues that cause the call quality to degrade suddenly in the middle of the transmission, as well as by generally poor line conditions that are causing a significant number of retries during the transmission, eventually causing the receiving equipment to "give up". If this happens chronically, please open a Support Ticket to report it.

Unexpected Disconnect

The call was connected, but then suddenly disconnected. This can happen at any point in the transmission. If it happens before or during the transmission, it could be caused by a problem with the recipient's equipment, a network issue, or very poor line quality. But it can also happen after the entire fax has been successfully sent. In order for FaxLogic to report a fax as successful, we must receive the final signal from the receiving equipment that confirms it has received everything we sent. Some equipment does not send that final signal (i.e. it simply disconnects instead), so even if the entire fax was received successfully, we will still report it as an unexpected disconnect, simply because we can not be certain.

Other Delivery Errors

There are other delivery errors that occur very rarely. They are reported as "General Errors" with a status of (X/YY). If you receive one of these, it is often a good idea to just try sending again, as these errors can sometimes occur as a "one-off" due to a variety of rare transient network or recipient-side issues. If you see the error again, or are seeing in to a particular recipient on a regular basis, please open a Support Ticket to report it.

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