"Inband" is a term used in telecommunications to describe a specific type of signaling or data transmission that is integrated within the main communication channel. However, if you are looking for alternative synonyms, you can consider using terms like "integrated", "embedded" or "incorporated". These words convey the idea of something being included or merged within a larger entity. Additionally, you can also utilize phrases like "within the primary channel" or "within the main transmission", to convey the same meaning as "inband". Using these synonyms will help you to diversify your language and make your communication more versatile and engaging.