iaxmodem is a software modem that uses the IAX protocol and registers to
Asterisk as an IAX client allowing HylaFAX all the resources of the
Asterisk PRI or whatever allows connectivity.
1. Does using iaxmodem imply that, for example, incoming fax calls are processed that way ?
- PSTN calls are terminated on TDM board (Digium, Sangoma, ...)
- the media flow (G711 as it comes from PSTN) is forwarded without any modification to the right instance of iaxmodem software process
- iaxmodem process are "managed" by hylafax application but are seen and identified by Asterisk as IAX softphones (during above mentioned registration)
- media is processed once, according hylafax config (that often means forwarded to printer or email), after a single "move" from TDM board to server processor through PCI bus
2. If it's correct, fax speeds and protocols (V29, G3, ...) are defined by hylafax and iaxmodem.
So, how do hylafax-iaxmodem speeds and protocols compare with those from a standard fax machine ?
I mean, if you had bought a new fax machine and had it connected to the PSTN, would you get a different set of speeds and protocols ?
3. How do iaxmodem and rxfax-txfax DSP functions compare ? Are they using the same library ? Is there any standard allowing iaxmodem or rxfax-txfax to benefit from hardware DSP inside TDM board ?
4. How would that scale ? Up to 30 Calls ? Are incoming or outgoing faxes more demanding ? Any hardware recommended ?
Cheers
Olivier
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