Example AMI Redirect command to answer ringing call on 202. Caller=203:
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Action: Redirect
Channel: SIP/203-09f7e4f0
Context: CTI_AUTO_ANSWER
Exten: 202
Priority: 1
ActionID: 8-srv06D1FFAF
Variable: SIPADDHEADER01=Call-Info: <sip:>\;answer-after=0



The Asterisk has to process this action and should in result 
send a new INVITE to extension 202 with auto-answer header.

And the telephone/softphone must have enabled the feature "auto-answer by call-info".
You have to search in your telephone/softphone configuration to find this feature.
Mabe, the feature does not exist at all.
