asterisk users - May 2003 - WARNING[65545]: ... I don't know how to authenticate methods

Hi,

Recently I am encountering an authentication error when making a phone call
between Asterisks.
That call is intended as follows.
(1) SIP_phone2 to Asterisk#2
(2) Asterisk#2 to Asterisk#3
(3) Asterisk#3 to SIP_Phone3

At (2), that is transferring a call such as
    -- Executing Dial("SIP/211-6da6",
"iax/k0.dyndns.org/302") in new stack
    -- Calling using options
'exten=302;callerid="sip-211";language=en;formats=4;capability=2147483519;ve
rsion=1;adsicpe=2'

    and encountering following error message:

    WARNING[65545]: File chan_iax.c, Line 3838 (socket_read): I don't know
how to authenticate methods=rsa;challenge=196090514;username=iaxtel to
61.125.27.147


I started to experience this error recently when I upgraded Asterisk a few
weeks ago.
With another Asterisk, say between Asterisk#2 and Asterisk#1, there are no
such a trouble.

It is highly appreciated if you let me know where I should examine.

Thank you very much,
Hiro
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