[OVH] can't receive calls

Hi

I have a SIP account at OVH and I configure Asterisk to send and receive calls

but i can't receive calls .

Here is my setup to receive calls:
---------------------------------------------------------------------------------------
* sip.conf :
- under [general] : register => 09799*****:
@sip.ovh.net
- under [general] : context = ovh-entrant

* extensions.conf :
I added the context:
[ovh-entrant]

exten => s,1,Answer() ; décrocher
exten => s,n,Playback(helpdesk)
exten => s,n,Background(main-menu)
exten => s,n,Background(enter-ext-of-person,m)
exten => s,n,WaitExten()
---------------------------------------------------------------------------------------

any solution ?