[Asterisk-Users] PSTN tone simulation

[ml_asterisk-users at rajnoch.sk]

Hi all
                                                                                                                                                                    
is there any way how can I simulate PSTN tone on asterisk.
                                                                                                                                                                    
I mean:
                                                                                                                                                                    
I take up phone, select number '9' (so I want to call to PSTN)
and asterisk change tone to something like . - . - . -
                                                                                                                                                                    
Thanks.