Asterisk 1.2 and md5 authentication

Hello

I have asterisk 1.2
I used softphone: idefisk 1.3.x
I upgraded idefisk to 2.0, and now i receive error:
Mar 29 11:14:45 NOTICE[20571]: chan_iax2.c:5227 register_verify: Host 192.168.100.95 failed MD5 authentication for ‘004’ (a224a14f4caf5b77caff67ccbde1177a != c114fbfb2122ba6efa9fbf378c33a5a3)

So now - by default idefish uses md5 authentication?. My iax.conf:
[004]
type=friend
setvar=REALCALLERIDNUM=004
secret=123456
record_out=Adhoc
record_in=Adhoc
qualify=yes
;port=4569
notransfer=yes
mailbox=004@device
host=dynamic
dial=IAX2/004
context=localusers
callerid=device <004>
auth=md5,rsa,plaintext

But it’s not working. What might be wrong ?

Thanx