Moises, Does libsangoma have a way to open a generic socket to get timing from in this manner? Ideally if we could get this into mod_freetdm we could make it auto set the timer_name variable in the new channels from the tdm source and have mod_conference auto set the timer as well if the first caller has a certain variable set. On Mon, Oct 21, 2013 at 7:48 PM, Bob Hartwig <bobjects@gmail.com> wrote:
OK, I uploaded this as a tarball to Jira, as an "improvement" issue type, for the FreeSWITCH project. Here is a paste of the description that I left there, for everyone's information:
I ran across a problem with a Dahdi-based FreeTDM system a few weeks ago. Because the timer for mod_conference was not synchronized to the T1 clock source, there was significant periodic on-conference noise. The problem was not that the "soft" timer was inaccurate; on the contrary, it was a very accurate 1 mS timer in a system that had a pretty inaccurate T1 clock coming in.
My solution was to create a new "mod_dahdi_timer", which derives the ~1 mS timer from 8 ticks of the 8 kHz /dev/dahdi/timer device. Then a one-line change to mod_conference.c to change "soft" to "dahdi", and the conference sounds perfectly clean.
Installation guidelines:
- Untar the tarball under the freeswitch source directory - Before ./configure build step, edit modules.conf, adding a line for "timers/mod_dahdi_timer" - Build as usual - Add a line to modules.conf.xml enabling mod_dahdi_timer
Testing the timer: - Only do this if you have a Dahdi T1 board installed and configured with dahdi_cfg. - "show timers" - verify that the new dahdi timer shows up. - timer_test 10 10 dahdi - timer_test 20 10 dahdi - timer_test 40 10 dahdi - timer_test 60 10 dahdi - timer_test 120 10 dahdi
Using the timer: - Into any config that allows for specifying a timer name, use "dahdi". This is especially useful for mod_conference.
Todo: - See TODO comments in mod_dahdi_timer.c . Exception handling may not be robust, and may fail spectacularly in systems with no configured Dahdi T1 board. - Comments at the top of mod_dahdi_timer.c may need to be expanded to include the normal FreeSWITCH copyright notices, etc.
On Mon, Oct 21, 2013 at 2:59 PM, Moises Silva <moises.silva@gmail.com>wrote:
On Mon, Oct 21, 2013 at 1:45 PM, Michael Jerris <mike@jerris.com> wrote:
Or for that matter, to put it right in to mod_freetdm.
Agreed, that would be better.
Moy
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