talking and interacting mean the same here.
I mean that "talking" is referring to voice/call conversations (it covers the time the agent interacting with customer during a phone call - i.e. the time the agent talking with customer during a phone call).
"interacting" refers to the same activity when the conversation is of a different media type like chat/email/message/...
I don't understand your comment.
"tTalk" is the name of the metric. It applies to voice conversations (and represents the talk time) and to conversations of other media type (chat/email/... - as agent doesn't "talk" to the customer in this case, the description of the metric mentioned Interacting which would represent the time the agent has spent on this conversation - from accepting to ending it).
O, i´m checking that point. I have a conversation where the client doesn´t pick up the phone and the tTalk is about 45 seconds. Seems like this metric is not having the time while call is connected with voice channel opened.