[Asterisk-Users] can't enable trunking :(

[Doug Woods]

Sorry if this subject has been covered, but, my boss claims to have a working IAX2 trunking set-up without a timing source on one side of the connection.  In all the posts and documentation regarding this subject, this appears to be impossible.  My questions are: 1) could this be true? 2) if it is - is there a load limit where it breaks down?  In summary, will IAX2 trunking work without some kind of timing source on both sides?  Thanks in advance and sorry if this is a rehash.

--Doug

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com]On Behalf Of Eric
Wieling
Sent: Thursday, February 17, 2005 10:45 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] can't enable trunking :(


Muhammad Muzzamil Luqman wrote:

> I have successfully installed and configured the asterisk, the incoming and the outgoing calls are working fine, its a tremendous solution :)
> 
> Now i want to enable trunking between two asterisk boxes, in the iax.conf i have put:
> 
> [karachi]
> ...
> ...
> ...
> trunk=yes
> ...
> ...
> ...
> 
> everything seems to work fine but when i load asterisk it says:
> 
> --------------
> Feb 17 10:59:14 WARNING[18726]: chan_iax2.c:7536 build_user: Unable to support trunking on user 'karachi' without zaptel timing
> Feb 17 10:59:14 WARNING[18726]: chan_iax2.c:7345 build_peer: Unable to support trunking on peer 'karachi' without zaptel timing
> --------------
> 
> I tried to install the ztdummy and i succeeded on one of the box but for the other i am having problems :(

If you can't install Zaptel (a real driver, ztdummy, zaprtc, etc) then 
you can't use trunking.  Remember trunking is only really useful when 
you have 3 or more calls at the same time between the same two 
Asterisk systems.  Trunking with only one call actually uses MORE 
bandwidth.
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