PRI inbound call (partial digits)


I have a PRI link from TELCO.
Incoming calls are received on this PRI with partial digits.
For example I have an extension number (3923200), when a person tries to call
this extension from outside, I receive a SETUP message on PRI link which contains only
the first 4 digits (3923), and after that, the remaining digits (200) are received in
an INFORMATION message.

On receiving the first message (3923), Asterisk checks it and reject the call because
it does not match any destination.

How can I configure Asterisk to accumulate the digits and determine the correct destination
after receiving all digits ?

Thanks in advance.