iaxmodem uses the spandsp library. So currently its modulation protocol
support is limited to V.27ter and V.29. Partial (sending) V.17 support
is available. V.34 (Super G3) support is not. So those are fax speeds
2400 bps through 14400 bps for sending and 2400 bps through 9600 bps for
receiving. Most new fax machines that you would purchase off-the shelf
would support either 2400-14400 or 2400-33600 depending on whether or
not it supported Super G3.
So, the suggested design for a fax-enabled PBX solution could be :
- for an "average fax use" (faxes from time to time, no fax mailings, telecom budget capable to bear longer durations for fax sendings), use an Asterisk-Hylafax-iaxmodem or your ITSP offering
- for an "intermediate fax use" (fax mailings from time to time, sensitive telecom budget), use an Asterisk server with TDM passthru and a dedicated Hylafax fax modem equiped server or dedicate some PSTN lines to a fax server
- for an "intensive fax use" (all day long fax mailings, high cost sensitivity), use a dedicated Fax Service Provider with competitive offering in the areas you are fax-mailing to.
What do you think of that ?
Regards
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