[Asterisk-Users] (Kphone) Registration Failed: Forbidden

[Ariel Molina Rueda]

I just can't get kphone to register with asterisk, i can make calls to 
the demos and even get into the mailbox but kphone cannot register. 
Here's my story. Can you help me?? Please

I have installed asterisk on debian using apt-get install asterisk.
I have configured an extension in extensions.conf as follows

    exten => 8003,1,Dial(Sip/8003,${RINGTIME},rt)
    exten => 8003,2,SetLanguage(en)
    exten => 8003,3,Voicemail(u8003)
    exten => 8003,103,Voicemail(b8003)
    exten => 8003,104,Hangup

And in sip.conf i have

    [8003]
    type=friend
    host=dynamic  ;<- This is supposed to allow registration, isnt it?
    callerid=Ariel Molina <8003>
    mailbox=8003
    dtfmmode=info
    username=ariel
    secret=wow
    disallow=all
    allow=ilbc
    allow=gsm
    allow=ulaw
    allow=alaw
    allow=g723.1
    allow=g729

However when i try to register with kphone i get a dialog asking for my 
passwd. I give it and then i get

(Kphone) Registration Failed: Forbidden

I know i've used the correct passwd, i've even tryed to configure it 
using no password. I dont get the dialog box but i get the same error.

My CLI output:

astsk*CLI> Feb 17 16:22:12 NOTICE[7689]: chan_sip.c:7654 handle_request: 
Registration from '"Ariel Molina" <sip:8003 at 10.8.5.138>' failed for 
'10.8.5.110'

Feb 17 16:22:12 NOTICE[7689]: chan_sip.c:7654 handle_request: 
Registration from '"Ariel Molina" <sip:8003 at 10.8.5.138>' failed for 
'10.8.5.110'
astsk*CLI>