Hi,
I have a simple question about SIP messaging. When a SIP client wants to
register to SIP registrar (for example asterisk), it sends a REGISTER message
and receives a Unauthorized message with a nonce value and it calculates a
challenge response using username password and this nonce value. A looked up to
the rfc about regsitration process but I couldn't understand how it computes
this response value.
What is the formula for this calculation. Which parameters does it use
exactly?
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