[asterisk-users] I don't know how to authenticate

[Phibee Network Operation Center]

Hi

anyone know what is a the solution of this problems ? :

[Nov 20 10:15:40] WARNING[12049]: chan_iax2.c:9232 socket_process: I 
don't know how to authenticate Voip-Classic to
[Nov 20 13:04:45] WARNING[12043]: chan_iax2.c:9232 socket_process: I 
don't know how to authenticate Voip-Classic to 78.XX.XX.XX

we have two Asterisk 1.6.1.4, this error are on the first server, used 
for the connection in SIP of
final user (personnal phone).

78.XX are the IP of our second server used for call routing.

We have tested in SIP and in IAX2 without change

thanks for your suggestion
jerome