[Freeswitch-users] Spandsp mulated modems inbound/no /dev/FS* device?
Anita Hall
anita.hall at simmortel.com
Thu May 24 12:07:10 MSD 2012
Many thanks to everybody!
I will put this on wiki but I am stuck at the very beginning. I am sorry
for being such a noob but this is my first tryst with modems.
I have modems appearing as /dev/FS[0-4] which link to /dev/pts/[4-7]
# ls -l /dev/FS?
lrwxrwxrwx 1 root root 10 2012-05-17 17:49 /dev/FS0 -> /dev/pts/4
lrwxrwxrwx 1 root root 10 2012-05-17 17:49 /dev/FS1 -> /dev/pts/5
lrwxrwxrwx 1 root root 10 2012-05-17 17:49 /dev/FS2 -> /dev/pts/6
lrwxrwxrwx 1 root root 10 2012-05-17 17:49 /dev/FS3 -> /dev/pts/7
lrwxrwxrwx 1 root root 10 2012-05-17 17:49 /dev/FS4 -> /dev/pts/8
But,
# cu -l /dev/FS0
cu: open (/dev/FS0): Permission denied
cu: /dev/FS0: Line in use
I think this is because FreeSWITCH is using this device, but then how does
HylaFax or any other program like cu talk to it ?
This page says that I should be able to check my modem before I configure
it with Hylafax.
http://www.hylafax.org/content/Handbook:Basic_Server_Configuration:Checking_your_Modem
regards,
Anita
On Tue, May 22, 2012 at 6:41 AM, Steve Underwood <steveu at coppice.org> wrote:
> What all this should tell us is a wiki page is badly needed on this
> topic. Specifically, people need clear information about:
> - How the modems appear to the user inside FS
> - How the modems appear to the user in /dev
> - How the permissions of the modems in /dev can be controlled, so
> non-root users are OK
> I still haven't seen anyone give information on the last point. Its easy
> to set up udev rules to control the generation of the pts devices in
> /dev, but I am not clear how to control the permissions during the
> creation of the links in /dev which give these devices meaningful names.
>
> Steve
>
>
> On 05/22/2012 07:28 AM, Michael Collins wrote:
> > I looked at the source, just to confirm and I believe Anthony is correct.
> >
> > Line 871 of mod_spandsp_modem.c:
> > switch_snprintf(name, sizeof(name), "modem/%d/%s", modem->slot, number);
> >
> > That would suggest a syntax just like FreeTDM, where the dialstring is
> > "modem/x/y" where x is the "slot" and y is the dialed number. Also, I
> > suspect this block starting at line 856 means you can use a literal
> > "a" for the slot and it will hunt for the next available modem:
> >
> > if (!strcasecmp(modem_id_string, "a")) {
> > modem_id = -1;
> > } else {
> > modem_id = atoi(modem_id_string);
> > }
> >
> > Please try this out and confirm. If possible, add the information to
> > the wiki. If you can't update the wiki then please report back and let
> > us know whether the dialstring format worked or not.
> >
> > Thanks,
> > MC
> >
> > On Mon, May 21, 2012 at 2:23 PM, Anthony Minessale
> > <anthony.minessale at gmail.com <mailto:anthony.minessale at gmail.com>>
> wrote:
> >
> > IIRC its modem/1 or 2 3 4 etc. Probably a for auto like tdm.
> > Check the code to be sure....
> >
> > On May 21, 2012 3:13 PM, "Alex Crow" <acrow at integrafin.co.uk
> > <mailto:acrow at integrafin.co.uk>> wrote:
> >
> > On 21/05/12 20:28, Ken Rice wrote:
> > >
> > >
> > > On 5/21/12 2:15 PM, "Alex Crow"<acrow at integrafin.co.uk
> > <mailto:acrow at integrafin.co.uk>> wrote:
> > >> Also I have the problem that unless FreeSWITCH is run as
> > root, the
> > >> device nodes are not created.
> > >>
> > >> Unless in the last few weeks some docs have been updated on
> > this, I'm
> > >> still stuck with T38modem.
> > >>
> > > If freeswitch running as root and not running as root
> > doesn't work, this
> > > should tell you that you have a permissions issue... The
> > FreeSWITCH
> > > developers fixing your systems perms issues is beyond the
> > scope of the
> > > FreeSWITCH project...
> > >
> > > Otherwise, the FreeSWITCH modems basically work just like
> > t38modem... The
> > > only setting is how many of them to create then the only
> > other settings is
> > > configuring your platform to properly allow freeswitch (or
> > the user that
> > > freeswitch is running as) create those devices then
> > configure hylafax to use
> > > them as normal.
> > >
> > > The steps to do this can vary from platform to platform (or
> > even versions of
> > > the platform. For example how you do this on centos5 is not
> > how you do this
> > > on centos6 due to changes in the platform.)
> > >
> > > K
> > >
> > >
> >
> > Ken,
> >
> > I respectfully disagree with the "like t38modem" bit of this.
> With
> > t38modem, you create a set of t38modem devices which actually
> > register
> > against FreeSWITCH and therefore appear as registered
> > endpoints, so it's
> > easy to route calls to them (ie transfer to "t38modem0 default
> > XML").
> > When I did run FS as root, despite the device nodes being
> > created, I saw
> > no endpoint registrations for the softmodems, nor did I find any
> > documentation saying that these endpoints may be addressed as,
> for
> > instance "spandsp/FSx".
> >
> > I am also used to writing udev rules, but I can't find
> > anything that
> > allows a non-root uid/gid user to create device nodes for a
> device
> > provided by a userspace program.
> >
> > It'd be great to avoid T38modem, and I've asked these
> > questions before,
> > namely:
> >
> > 1) Does anyone have any examples on any platform of tweaking
> > udev to
> > allow FreeSWITCH to create device nodes at startup when
> > running as, say,
> > user freeswitch or user www-data (without making the primary
> > group of
> > said users "root" or setting setuid root on the executable). I
> > am not
> > prepared to take the risk of running as either effective uid
> > or gid 0.
> > Please share if so. I'm running on debian stable.
> >
> > 2) How does one direct an incoming call, say, from FreeTDM or
> > a SIP/ISDN
> > gateway to one of the softmodems. I cannot find this in the docs.
> >
> > If we can divorce these questions from any association with
> > another
> > user's questions on this list that's fine. I've tried to help
> that
> > person as much as I can out of my own good nature.
> >
> > Cheers
> >
> > Alex
> >
> >
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