From-Zaptel Entry In Extension.conf

Hi Everyone,

I am using Sangome A101d /T1/E1 pri card. All configurations have been made and the pri line is active also. I have created a simple dialplan in the extension.conf file , which is as follows.
[general]

///////////////////////////////////////////////////////////////////////////////////////////////////////
static=yes
writeprotect=yes

[bogon-calls]

exten => _.,1,Congestion

[from-zaptel]

exten => 4319,1,Answer
exten => 4319,n,Wait
exten => 4319,n,SayDigits(${CALLERID(num)})
exten => 4319,n,HangUp()
//////////////////////////////////////////////////////////////////////////////////////////////////////

In the above extension.conf file "4319" are the last 4 digits of the PRI E1 Line.
An entension 201 has also been created from freepbx extension menu.

What modification do I have to make in the extension.conf file so that when anyone calls on the PRI E1 Line number, the extension 201 should start ringing and when the extension 201 offhook the call should be established with the caller and extension 201.

Thanking you,

Nommy.