Dialplan problems

Two things don’t work with my asterik dial plan:
1/ The echo(): my sip softphone print trying
2/The s extension: It is expected to handle every outgoing call

exten => s,1,Answer( )
exten => s,2,Playback(/var/lib/asterisk/sounds/hello-world)
exten => s,3,Hangup( )

My soft Phone prints not found, that means that it does not find the dialed number, so the s extention failed to match this dialed number.

When launching the asterisk whith enough verbosity, I get some Timing Warnings, does this explain the pb.