SIP - authentication

root-me challenge SIP - authentication: Find the password used to authenticate on the SIP infrastructure.

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172.25.105.3"172.25.105.40"555"asterisk"REGISTER"sip:172.25.105.40"4787f7ce""""PLAIN"1234
172.25.105.3"172.25.105.40"555"asterisk"INVITE"sip:1000@172.25.105.40"70fbfdae""""MD5"aa533f6efa2b2abac675c1ee6cbde327
172.25.105.3"172.25.105.40"555"asterisk"BYE"sip:1000@172.25.105.40"70fbfdae""""MD5"0b306e9db1f819dd824acf3227b60e07

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Clear, this.