DTMF on voipbuster

Hi all,
So i have an asterisk server. He is registered as client to VoIPbuster.
With my personal computer I can phone to the server. If in the extensions.conf, i redirect the call on a phone all it’s ok, and I heard the DTMF tone when I pressing a button on the voipbuster software.
But if I want read a number, to make a menu, asterisk don’t recognize anything.

Can you help me?

Here is a part of my sip.conf :

[voipbuster]
type=peer
host=sip1.voipbuster.com
username=XXXXX
fromuser=XXXXX
secret=XXXXX
context=frombust
insecure=very
dtmf=inband
disallow=all
allow=ulaw
allow=alaw

[voipbuster-in]
type=peer
context=frombust
host=sip1.voipbuster.com
disallow=all
allow=ulaw
allow=alaw
dtmf=inband

[general]
relaxdtmf=yes
canreinvite = no
nat = yes
allowoverlap = no
bindport = 5060
bindaddr = 0.0.0.0
srvlookup = yes
context = default
language = fr
register => XXXXX:XXXX@sip1.voipbuster.com

And here the extension.conf :

[frombust]
exten => s,1,Answer()
exten => s,2,Goto(menu01,s,1)

[menu01]
exten => s,1,Playback(conf-thereare)
exten => s,2,Read(NUMBER,,1)
exten => s,3,GotoIf($[${NUMBER} = 1]?6:4)
exten => s,4,GotoIf($[${NUMBER} = 2]?7:5)
exten => s,5,GotoIf($[${NUMBER} = 3]?8:9)
exten => s,6,Dial(SIP/pompiers)
exten => s,7,Dial(SIP/cab1_in)
exten => s,8,Dial(SIP/cab1_out)
exten => s,9,Hangup()