"To open the channel" means to create a way or opportunity for communication or information to flow between two or more people or groups. Full definition
You pay for a set number of credits, which are exchanged for the privilege of opening a channel of communication with your chosen match. (askmen.com)
Every nation should be encouraged to use its resources and the capabilities of its citizens most efficiently, and this requires open channels for the exchange of goods and services. (religion-online.org)
Rather than feel threatened by transparency, turn it to your advantage by keeping open channels of communication with your customers. (rocketlawyer.com)