[Asterisk-Users] Double-ring tone

[Julian Lyndon-Smith]

I upgraded my Cisco7960 to SIP 8-2 from 7-4. Everything seems ok, works 
fine. Except that when I make an outbound call, I get a double-ring 
sound. I also found that if the target number is engaged, I get a ring 
sound and at the same time get a busy sound.

If I revert back to 7-4, there is no problem.

Anyone else had this, or any clues on how to fix it ? All of our other 
phones are still on 7-4.

TIA.

Julian