[SIPForum-discussion] SRTP master key determination is through configurations at the end points? or through SDP exchanges?

[Norah Jones]

Hi, 

In case of a SRTP call setup through SIP session setup, is the master key exchanged between the two parties? 
or they have got their master keys through configuration and then use KDF to get the encryption keys for the session?

Thanks,
Norah Jones