asterisk users - Apr 2004 - SIP IAX2 MySQL Config

I've configured asterisk to connect a MySQL database for CDR, Voicemail and
SIP/IAX2 peers.
- CDR are reccorded
- Voicemail config is readen directly in the database

but SIP/IAX2 peers still have to be declared in sip/iax2.conf to make
calls... However, when I restart Asterisk:

 [chan_sip.so] => (Session Initiation Protocol (SIP))
  == Parsing '/etc/asterisk/sip.conf': Found
  == SIP Listening on 192.168.0.10:5060
  == Using TOS bits 0
 Connected to database 'asterisk_config' on 'localhost' as
'asterisk_user'
  == Registered channel type 'SIP' (Session Initiation Protocol (SIP))
  == Registered application 'SIPDtmfMode'

[chan_iax2.so] => (Inter Asterisk eXchange (Ver 2))
Apr 16 14:10:34 WARNING[1074449120]: chan_iax2.c:6218 load_module: Unable
to open IAX timing interface: No such device
  == Manager registered action IAXpeers
  == Parsing '/etc/asterisk/iax.conf': Found
 Connected to database 'asterisk_config' on 'localhost' as
'asterisk_user'
  == Registered channel type 'IAX2' (Inter Asterisk eXchange Driver (Ver
  2))
  == Using TOS bits 0
  == IAX Ready and Listening on 192.168.0.10 port 4569

 What is the problem?
Thanks.