outbound.go
func (c *Connection) handleCallRes(frame *Frame) bool {
	if err := c.outbound.forwardPeerFrame(frame); err != nil {
		return true
	}
	return false
}
func (c *Connection) handleCallRes(frame *Frame) bool {
	if err := c.outbound.forwardPeerFrame(frame); err != nil {
		return true
	}
	return false
}
// handleCallRes handles an incoming call req message, forwarding the
// frame to the response channel waiting for it