Hello,
Help!...  I have a problem
One of our  customer using 

2600 (IOS (tm) C2600 Software (C2600-IS-M), Version 12.0(2a), RELEASE
SOFTWARE (fc1) series 
FXS and FXO voice cards
and 

3640 IOS (tm) 3600 Software (C3640-IS-M), Version 12.0(8), RELEASE SOFTWARE
(fc1)
E&M voice cards

on their WAN and running VoIP, We replaced the 3640 with a 

3660     IOS (tm) 3600 Software (C3640-IS-M), Version 12.0(8), RELEASE
SOFTWARE (fc1)
FXS voice cards

Now we have voice problem. Whenever we try to place a call we hear only some
strange noises....

Do you know the reason?... or can we solve it?... (Any solution other than
IOS upgrade will be highly appriciated)

Thanx 






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