Sipp documentation requires 3 values to be supplied as inthis example: 
Digest/AKA:(example: [authentication 
username=HappyFeetaka_OP=0xCDC202D5123E20F62B6D676AC72CB318aka_K=0x465B5CE8B199B49FAA5F0A2EE238A6BC
 aka_AMF=0xB9B9])    
    
    
   - username: username: if no username is specified, the username is taken 
from the '-au' (authentication username) or '-s' (service) command line 
parameter
    
   - aka_K: Permanent secret key. If no aka_K is provided, the "password" 
attributed is used as aka_K.
    
   - aka_OP: OPerator variant key
    
   - aka_AMF: Authentication Management Field (indicates the algorithm and key 
in use)
   I am thinking that aka_OP is the shared secret key thatresides in the 
Authentication center as well as on the ISIM.  aka_OP isthe RAND value that HLR 
provides in SendAuthenticationInfo Response.  aka_AMF is probably aconstant as 
specified in the example above.
Can I use the values received in the 401 Challenge and how?
I am looking for an answer to confirm my understanding or tell me where I am 
wrong.
Thanks 
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