[Asterisk-Users] Long delay via Teliax

[Joseph]

I'm testing Teliax tall free number line and I'm experiencing long delay
about 1sec. during conversation.
When I call myself over FWD the response is normal no delay or cut
messages.
When I call my number over FWD the is a long delay, welcome message
usually cuts off few first words and during conversation my voice
arrives after about 1sec. delay.  
Since, the 800-number is only accessible from USA and I'm in Canada, the
only way I can test it is by calling it over FWD.

I've tested codec: ulaw and gsm
What might be causing such a problem?

-- 
#Joseph