[Freeswitch-users] Spandsp mulated modems inbound/no /dev/FS* device?

Tue May 22 05:11:10 MSD 2012

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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