[asterisk-users] Strange problem

[Accursio Avona]

Hi All,
i'm experiencing a strange problem on sip channel. 
Sometime appens that the sip client ring as if it recieves 3 calls at the same time from the same number, even if thre is only a single call.

I'm experiencing that both on the softphone sjphone and on the sip phone Grandstream GXP2000
an on two asterisk box
one asterisk v 1.0.7
the second asterisk 1.2.16
I have not idea where to start for debug this 
Someone can help me?
thank's in advance
Accursio
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