When you set TALK_DETECT(SET) channel variable, Asterisk will send ChannelTalkingStart and ChannelTalkingStop via AMI when detected on that channel. The current version of asterisk-java does not recognize this. It does recognize it for conference calls(ConfBridgeTalkingEvent). Please consider adding support for this!

Event: ChannelTalkingStart
Privilege: call,all
Channel: SIP/user-00000001
ChannelState: 6
ChannelStateDesc: Up
CallerIDNum: 100
CallerIDName:
ConnectedLineNum:
ConnectedLineName:
Language: en
AccountCode:
Context: phones
Exten: 5
Priority: 4
Uniqueid: 1547252114.0
Linkedid: 1547252114.0
Duration: 6030

Event: ChannelTalkingStop
Privilege: call,all
Channel: SIP/user-00000001
ChannelState: 6
ChannelStateDesc: Up
CallerIDNum: 100
CallerIDName:
ConnectedLineNum:
ConnectedLineName:
Language: en
AccountCode:
Context: phones
Exten: 5
Priority: 4
Uniqueid: 1547252114.0
Linkedid: 1547252114.0
Duration: 6030