Since Slack is not a telephony tool, your cell phone is used to carry the call when you call through Slack Telephony. You initiate the call in Slack, via a command or by clicking the Shorcuts button. Then the call is sent via Dstny’s exchange, which in turn is distributed to you and your recipient. The call itself is then held on your mobile phone.
By integrating Dstny with Slack, you do not have to switch between different programs. Make calls and send texts from Slack while your presence in the exchange appears directly in the interface.