Quote from: Stewart on April 29, 2012, 12:47:59 PM
Neither fax machine needs any special capability and should not require any special settings.
I've come across this about the T.38 protocol:
http://www.soft-switch.org/t38/index.htmlIt indicates that the end points of the T.38 communication should be capable of T.38 - either as terminals (e.g. T.38 ATAs with analog FAX machines attached) or as T.38 gateways between the IP world and the PSTN. It seems then, that the ATA in the Obi202 speaks T.38 with the service provider's T.38 gateway at the destination local carrier where the data packets transition from the Internet to the PSTN. Since that transition point can be on the other side of the world, the VoIP service provider may have little control of whether T.38 can be used for FAXes to, say, China or Pakistan. Is that right?
QuoteHowever, to benefit from T.38, the service provider must support it. At the present time, Google Voice does not. Callcentric does....
CallCentric says:
"Technically we support fax using either the T.38 protocol or transparently with G.711. However, both largely depend on the reliability/stability of your internet connection. An internet connection with regular packet loss, high latency (ping) to our servers, and/or jitter (large variations in the latency) will cause problems for faxing. While we do support it, and it does work - we can't tell you how reliable it will be on your internet connection without you actually trying it."
and:
"And finally the major factor which may determine your experience with faxing will depend on where you are sending the fax. Sometimes some carriers we purchase our termination through will not have networks that are compatible or sufficient for faxing."
This makes FAX-over-IP, even using T.38, an iffy process, and maybe easy within the U.S. but not so reliable overseas. Has anyone here yet had any experience with Obihai's T.38 FAXing?
*TimDan*