* You are viewing the archive for June 1st, 2012

Fax over IP?

Hi Tim,

Thanks for your response. Here is my topology as listing down below;

PSTN Line –> Cisco Voice GW –> IP Cloud –> Asterisk

Will Asterisk able to receive the fax (as in topology above) using its’ fax
module? In sip.conf I enabled fax detection and T.38. Actually I don’t
want
to use Hylafax + iaxmodem as per requirement.

Please advice.

> Date: Fri, 1 Jun 2012 10:19:12 -0400
> From: Ahmed Munir
> Subject: [asterisk-users] Fax over IP ?
> To: asterisk-users@lists.digium.com
> Message-ID:
> > >
> Content-Type: text/plain; charset=”iso-8859-1″
>
> Hi all,
>
> Couple of things I would like ask, does Asterisk provides free license for
> FoIP (for 1 channel) or need to purchase it? Couple of years back, I was
> able to send and receive the fax using Digium T1 card, in term of FoIP how
> can I able to receive fax from traditional telephone lines / T1 lines? As
> far my understanding, the functionality for FoIP is to send fax to email or
> receive fax from email i.e. using T.38 protocol.
>
> The thing I would like to know how I can implement this solution i.e.
> receiving fax via IP? Correct me if I’m wrong, while receiving fax from
> traditional telephone lines will the topology looks like as listed below;
>
> PSTN Lines –> Asterisk (mounted a T1/ analog card) –> IP –> Asterisk
> (receive Fax over IP)
>
> or else?
>
> Please advice.
>
>
> –
> Regards,
>
> Ahmed Munir Chohan
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> Message: 15
> Date: Fri, 1 Jun 2012 09:29:19 -0500 (CDT)
> From: Tim Nelson
> Subject: Re: [asterisk-users] Fax over IP ?
> To: Asterisk Users Mailing List – Non-Commercial Discussion
>
> Message-ID: <2939915.57880.1338560959074.JavaMail.root@rockbochs.com>
> Content-Type: text/plain; charset=utf-8
>
> —– Original Message —–
> > Hi all,
> > Couple of things I would like ask, does Asterisk provides free
> > license for FoIP (for 1 channel) or need to purchase it? Couple of
> > years back, I was able to send and receive the fax using Digium T1
> > card, in term of FoIP how can I able to receive fax from traditional
> > telephone lines / T1 lines? As far my understanding, the
> > functionality for FoIP is to send fax to email or receive fax from
> > email i.e. using T.38 protocol.
> > The thing I would like to know how I can implement this solution i.e.
> > receiving fax via IP? Correct me if I’m wrong, while receiving fax
> > from traditional telephone lines will the topology looks like as
> > listed below;
> > PSTN Lines –> Asterisk (mounted a T1/ analog card) –> IP –>
> > Asterisk (receive Fax over IP)
> > or else?
>
> FoIP typically means the fax session traverses an IP link at some point,
> most commonly at the ‘last mile’. What happens to the fax after that is up
> to your requirements. The faxes can be emailed out, stored in a web
> application, printed to a printer, etc. The possibilities are endless.
>
> Asterisk does have a few options for faxing. Those are most notably:
>
> 1. Fax for Asterisk – Free license available for 1 channel, or paid
> licenses for 2+ channels
> 2. app_fax (I think this is the current module name) – Free fax module for
> Asterisk, no channel limit, based on SpanDSP
> 3. Hylafax+ and IAXmodem – Most complicated method of fax setup, but most
> robust and reliable (in my testing). Would require use of Asterisk 10 with
> T.38 gateway functionality for proper fax reception.
>
> Just keep in mind raw fax audio over VoIP is a bad idea, see here:
> http://www.soft-switch.org/foip.html
>
> If you can provide some additional details on what you’re planning to do,
> we can give more info.
>
> –Tim
>
>
>
> ——————————
>
> Message: 16
> Date: Fri, 1 Jun 2012 09:36:50 -0500 (CDT)
> From: Tim Nelson
> Subject: Re: [asterisk-users] Fax Server for Asterisk
> To: Asterisk Users Mailing List – Non-Commercial Discussion
>
> Message-ID: <13867195.58161.1338561410617.JavaMail.root@rockbochs.com>
> Content-Type: text/plain; charset=utf-8
>
> —– Original Message —–
> > Hi Tim,
> > Unfortunately i can’t reproduce the scenario because it was a long
> > time ago. But it would be nice to hear from you, what things can be
> > verified within fax and Asterisk? Any TIP on wireshark monitoring?
>
> Within Asterisk, the debug logs can be helpful for routing/connectivity
> diagnostics. With Hylafax, all of your details will be found in the session
> logs in /var/spool/hylafax/log. Here you can see each session’s interaction
> with the remote fax device. It is an art deciphering the various protocols,
> but the folks on the Hylafax lists are incredibly helpful until you’ve
> learned the magic of understanding the logs directly. :)
>
> –Tim
>

Session-timers and TCP

All,

We are having issues with one of our customers. They typically are
using remote sip clients on smart phones. For the purpose of allowing
the apps to work properly in the background we have to utilize TCP which
works fine.

The problem comes up when the softphone loses connectivity for some
reason. The session timers are not ending the call as they do on a UDP
session. Basically from the sip debug it sends the re-invite for the
session timer according to the sip debug and it appears all is fine
instead of not getting a response back from the client and disconnecting
the call as it does with udp. There is no way it is getting a response
back from the client however as the client has no network connectivity.

I have run some tcpdump’s on the server and when tracing the call I
actually never see those re-invites going out at all from the server.

We are running asterisk 1.8.7.0 currently.

I can reproduce the issue at will by establishing a call from a
softphone and then putting it into airplane mode to simulate the
connectivity loss.

Are session-timers expected to work with tcp? If so can anyone tell me
where to look to see what might be going on?

Thanks in Advance.

Half-height PCIe analog FXO card

Ade-

> Does anyone do a low profile PCIe FXO card? I just picked up an HP ProLiant
> microserver for $nuppence, which I’d hoped to migrate my Asterisk setup
> onto. I currently use an A400P analog card, but the ProLiant only has PCIe
> slots, and they’re short ones too, so I can’t use an A400E card. Even the
> Sangoma cards, which seem to be low profile, have full-height brackets on
> them – which, of course, won’t fit in the box.
>
> Is it just me, or is this whole half-height PCIe thing a complete b***ocks?

Hehe, that makes me laugh. Thanks to huge power-hungry GPU boards, the full length/height slots — which I thought
were dead in the late 1990s — have come back and established their rightful position :-)

-Jeff

no audio

Calling into 10.5.0-rc2 from a pstn did provider, I get no audio:

Fax over IP ?

Hi all,

Couple of things I would like ask, does Asterisk provides free license for
FoIP (for 1 channel) or need to purchase it? Couple of years back, I was
able to send and receive the fax using Digium T1 card, in term of FoIP how
can I able to receive fax from traditional telephone lines / T1 lines? As
far my understanding, the functionality for FoIP is to send fax to email or
receive fax from email i.e. using T.38 protocol.

The thing I would like to know how I can implement this solution i.e.
receiving fax via IP? Correct me if I’m wrong, while receiving fax from
traditional telephone lines will the topology looks like as listed below;

PSTN Lines –> Asterisk (mounted a T1/ analog card) –> IP –> Asterisk
(receive Fax over IP)

or else?

Please advice.