[Asterisk-Users] Cisco ATA186 and Asterisk dialplan

[Dan]

Hi all,

I have a Cisco ATA186 connected to an Asterisk Server (SIP)
The dialplan uses 1XX for local extensions and XXXXXXX for
external numbers, where the first digit is always different than 1.
In this moment, when I dial 123 for example, ATA waits till 
timeout before dialing that number. The same for the longer one.
How can I do to make it dial imediately when 3 digits starting with 
1 are received?

Thank you and best regards,
Dan