Hi,
My problem this faith is connected to the dialplan I think.
becaufe when I dial a number to call, it cut even before I finished entering the number and I see call fails 
Pleaaase help 
Since I do not have my chrystal ball with me, you will have to do a bit better than that. Please describe you problem in detail and attach a detailed Asterisk debug.
If you are using a SIP phone, I would check the Inter Digit Timeout parameter.
Hi,
Thank you for reply,
I have an Asterisk 1.8 server connected to OpenIP via a Trunk SIP. In fact, I have two problems:
1.the call is disconnected after typing 2 or 3 digits,
I have this show in the Console of Asterisk
[Oct 17 11:16:13] NOTICE[1476]: chan_sip.c:21358 handle_request_invite: Call from ‘1900’ to extension ‘017’ rejected because extension not found in context ‘default’.
- the call is disconnected after 2 or 3 rings, or during the conversation.
For the first one how can I check the Inter Digit Timeout parameter ?