Adding a new configurable radius module that will support both authentication based on a dialplan app, as well as digest based radius authentication by hooking into the directory. It is also fully configurable on which fields to send by the config file.

Colour and grey images can down be dithered down to bi-level images for transmission as faxes.
More movement towards T.42 support

Resolves OPENZAP-189

Fixes:
	src/ftmod/ftmod_isdn/ftmod_isdn.c: In function 'ftdm_isdn_931_34':
	src/ftmod/ftmod_isdn/ftmod_isdn.c:902:21: error: variable 'status' set but not used [-Werror=unused-but-set-variable]
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

*sigh* of course there are two versions of strerror_r():

	char *strerror_r() - GNU
	int strerror_r() - non-GNU

Revert and back the drawing board...

This reverts commit 3c82033e.

FS-4481 --resolve seg is fixed but just utf-8 will not work. you need type/subtype format like text/utf-8

strerror_r() returns the error message string (and expects you to use it).
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

add api-expansion to switch.conf.xml and fsctl api_expansion command to control allowing apis to be expanded via variable expansion

Fixes:
  src/ftmod/ftmod_misdn/ftmod_misdn.c: In function 'misdn_handle_mph_information_ind':
  src/ftmod/ftmod_misdn/ftmod_misdn.c:871:3: error: format '%lx' expects argument of type 'long unsigned int', but argument 13 has type 'uint64_t' [-Werror=format]
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

FS-4470 try this, the tmp_hanguphook will flag the b leg with CF_REDIRECT in the event that it hangs up which should spare it from the codepath in exchange_media state

Do a "soft" wraparound with modulo, removes the ~0.5s tone glitch.
(Multiply ts.rate (samples) by two to match the offset unit (bytes, 2 per sample).)
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

Store the offset in the teletone buffer in the b-channel private data.

An NT-mode setup with ftmod_misdn showed severe (dial-)tone distortions
in a sound editor (330Hz sine wave phase errors), caused by
using a global teletone buffer offset.

Switching to a per-channel offset, that is advanced by the amount
of data actually written to the channel, removes (almost) all
distortions.

There is still a minimal phase error every ~500ms (audible) that
needs more investigating.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>