[Asterisk-Users] Auto Dialing

[Simon]

In my house i am using an autodialer to dial 74949000 to access to 
gateway and then i dial my mobile or local number to benefit from the saving
Can we do that in asterisk to autodial to the gateway 74949000 and wait 
10 before i eneter my destination number

Please advise me on that how to make a effective dialplan...suing the 
above information

Thanking you in advance