I did not test this but
the chat icon appears on virtually every page of the site.
Not exact matches
Instagram
appears to be planning new video
chat and voice call features, according to leaked
icons and screens.
The video call
icon in Instagram Direct will only allegedly
appear when a
chat request has already been accepted by the recipient.
Tapping on the
chat icon in the mobile app causes a microphone button to
appear; holding down the button lets you transmit your voice through the camera's speaker.