Re: [hylafax-users] Hylafax/IAXmodem

["Art Tarsha" <atarsha@xxxxxxxxx>]

I am running iaxmodem on the Asterisk server.. From what I understand
the "not hungup yet" message is a standard message following a cause 16
"normal clearing". I receive the no carrier detected on both incoming
and outgoing. I've tried different fax machines etc. I've monitored the
zaptel channels I can see rx and tx its very bazaar.

-Art

-----Original Message-----
From: hylafax-users-bounce@xxxxxxxxxxx
[mailto:hylafax-users-bounce@xxxxxxxxxxx] On Behalf Of Lee Howard
Sent: Friday, February 15, 2008 2:43 PM
To: mvaillancourt@xxxxxxxxx
Cc: hylafax-users@xxxxxxxxxxx
Subject: Re: [hylafax-users] Hylafax/IAXmodem

Michel R Vaillancourt wrote:
> Lee Howard wrote:
>> You're not running iaxmodem on the same system as Asterisk?
>>
>>> [Feb 15 14:01:18] VERBOSE[27913] logger.c:     -- Zap/2-1 is
proceeding
>>> passing it to IAX2/198-4
>    FYI, Lee, I've tested this with 60-page faxes over 100Mbit LAN... 
> it works fine.  I've seen no difference than running it on the same 
> machine as the PBX.

While I do not doubt that in some circumstances running iaxmodem's IAX2 
channels over a LAN (or even a WAN) may "work fine", it is an extremely 
difficult scenario to reproduce consistently over varied network 
infrastructures and designs.  So it's ill-advised for me to solicit to 
others that "this works fine" when in reality it very well may not work 
at all for them (and there'd be nothing that they could do about it 
without redesigning and rebuilding their network).

Furthermore, you could enable iaxmodem's jitterbuffer (which tends to 
only make things worse than if it were off) and then if things get worse

you can know that there is jitter on the line but that iaxmodem's design

(and quite probably HylaFAX's as well) is compensating adequately.  If 
things don't get worse when enabling the jitterbuffer then you'd have to

do a more deep analysis to see if any jitter is occurring at all 
(perhaps even by doing network sniffing, etc... which I've done in the 
past and which has led me to the conclusions that I'm giving here).

Thanks,

Lee.


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