[asterisk-users] asterisk 1.4.10 on linux kernel 2.6 needs timing device for trunking

joakimsen at gmail.com joakimsen at gmail.com
Tue Nov 6 16:16:41 CST 2007

On 11/6/07, Hans Feringa <linux at shelob.nl> wrote:
> I understood that a timing device (ztdummy if no zaptel hardware is
> present) was not necessary anymore with linux kernel 2.6.
> When I enable iax2 trunking I get this warning
>  chan_iax2.c:8908 build_user: Unable to support trunking on user 'xxxxxx'
> without zaptel timing
> The linux kernel is 2.6.22-14-386
> Can I ignore this message, and is trunking working despite this warning?
> The ztdummy module is not part of the zaptel ubuntu package, so it cannot
> be loaded. I wanted to install from ubuntu packages for a change and not
> compile it from source.
> rgds,

I believe that's OpenPBX that tries to derive its timing without
Zaptel devices, however then you need to recompile your Kernel with
1000Hz timing as most use ~250Hz by default. Linux 2.6 + Ztdummy works
fine and I'll take that over having to recompile the Kernel any day.

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