Hi Steve,
you are telling me there is no way to set a particular speed on my
iaxmodem in order to force the sender speed?
I have some problems with a customer who gets malformed faxes even if no
error occurs. Since I cannot tell the sender to lower its fax speed, my
idea is to force my iaxmodem to a lower fixed speed so the sender is
oblidged to negotiate at that speed (or lower, of course) without the
customer could realize it, at least at first. :)
There is no ATA in the middle (I'm using it for my tests but my customer
does not have any), all faxes are received thru a primary channel to a
bunch of iaxmodems. Sometimes some faxes are corrupted, that's why I
thought to lower the speed. I could try to disable ECM but that's even
harder to do (found nothing on internet).
Thank you
Giorgio
On 05/16/2012 07:24 PM, Steve Underwood wrote:
Hi,
On 05/16/2012 09:59 PM, Larry Moore wrote:
Read the subject line more closely.
Tested receiving too,
I set the Send & Receive speed of the receiving analogue modem to
that below, the log file on the sending modem (iaxmodem) reported it
capable of 9600.
May 16 21:32:04.28: [ 2335]: REMOTE best rate 9600 bit/s
May 16 21:32:04.28: [ 2335]: REMOTE max A3 page width (303 mm)
May 16 21:32:04.28: [ 2335]: REMOTE max unlimited page length
May 16 21:32:04.28: [ 2335]: REMOTE best vres R16 x 15.4 line/mm
May 16 21:32:04.28: [ 2335]: REMOTE format support: MH, MR, MMR
May 16 21:32:04.28: [ 2335]: REMOTE supports T.30 Annex A, 256-byte ECM
May 16 21:32:04.28: [ 2335]: REMOTE best 0 ms/scanline
May 16 21:32:04.28: [ 2335]: USE 9600 bit/s
Perhaps the issue is with Hylafax.
Setting the Transmit & Receive strings to "!24,48,72,96" seems to
yield the most reliability in transmission
If you have an ATA in the path that is often the case. Many of them
badly mess up a FAX signal. Without such a distortion machine V.17
should be fine.
Cheers,
Larry.
On 16/05/2012 7:23 PM, Larry Moore wrote:
I have iaxmodem version 1.2.0 installed on my system.
I have set the following in the IAX configuration file, SIGHUP'd
FaxGetty and submitted a single page outbound fax via Asterisk;
Class1RMQueryCmd: "!24,48,72" # enable this to disable
V.17 receiving
Class1TMQueryCmd: "!24,48,72" # enable this to disable
V.17 sending
The resulting output from my T.38 Gateway reports the following;
-- Connection Statistics
Bit Rate :7200
ECM : No
Pages : 1
-- Hungup 'IAX2/iaxmodem0-11055'
I also tested with the maximum speed set to 4800, the image was
received however the responses to EOP timed out, I don't know if the
is to do with my Asterisk T.38 gateway or my VoIP providers T.38
gateway. The result was the fax was retried for the defined number
of attempts.
Cheers,
Larry.
On 16/05/2012 6:28 PM, gincantalupo wrote:
Hi all,
I'm trying to lower my iaxmodem speed but still I haven't found any
solution...I tried to add
Class1RMQueryCmd: "!24,48,72"
to config.IAXtty but does not work...Hylafax says it it running at
9600 (sometimes at 14400) baud..
This is correct behaviour. The sending side has fine control over the
modem modes it uses. The receiving side can only specify that V.27ter,
or V.27ter+V.29 or V.27ter+V.29+V.17 are OK. So, if you allow the
7200bps mode of V.29 you are compelled to allows the 9600bps mode too.
Steve
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