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chevrolux: low speed data services like faxing and dialup dont work over VoIP because of the way audio is mucked around when its packaged up to be sent via IP.
This. In simplistic terms faxing was an analogue encoding of a digital signal, so the process went D->A->D from end to end. If you replace the analogue connection between the endpoints with VoIP with a lossy digital audio codec optimised for speech the process becomes D->A->D->A->D with information about the original analogue signal being lost in those 2 extra conversions. T.38 is way of removing the lossy voice codecs and getting the end to end signalling working, but it is often not fully implemented at both ends so will not work.
EDIT: Read this. Looks a bit dated, but so is faxing...
cyril7: Hi Steve, your comment re pharmacies and doctors with the events of the past few weeks that has significantly changed and honestly I see and the bunch of pharmacists I know say, it's all changed.
Covit19 has buried fax in that industry well and good, anyone hanging on is in lala land
Cyril
RunningMan:
chevrolux: low speed data services like faxing and dialup dont work over VoIP because of the way audio is mucked around when its packaged up to be sent via IP.
This. In simplistic terms faxing was an analogue encoding of a digital signal, so the process went D->A->D from end to end. If you replace the analogue connection between the endpoints with VoIP with a lossy digital audio codec optimised for speech the process becomes D->A->D->A->D with information about the original analogue signal being lost in those 2 extra conversions. T.38 is way of removing the lossy voice codecs and getting the end to end signalling working, but it is often not fully implemented at both ends so will not work.
EDIT: Read this. Looks a bit dated, but so is faxing...
Not quite.. Remember phone exchanges are digital and have been since NEAX's were installed from the late 70s. Your phone may be analogue, but it becomes a digital signal once it hits a NEAX, and uses alaw (or ulaw in the US) and SS7 for backhaul and interconnectivity to other networks.
Oh well
There is always a problem in passing on third party information. AFAIK my friend was told that his fax machine ?analogue? wouldn't work although his phones- via a wifi network based on a modem- would... Who knows.
daringpeter:
Oh well
There is always a problem in passing on third party information. AFAIK my friend was told that his fax machine ?analogue? wouldn't work although his phones- via a wifi network based on a modem- would... Who knows.
It won't work reliably. Other than that the why is pretty irrelevant. No one really cares anymore.
There is no business in providing fax equipment or services.
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