Communication in a software outsourcing company usually follows the following approach:
Both parties engage in detailed discussions to define project requirements, goals, and expectations. This helps establish a clear understanding of the project scope and deliverables.
Teams establish communication channels: e.g. emails, video conferences,  instant messaging platforms and other project management tools. These channels enable regular updates, discussions, and issue resolution.
Both sides conduct meetings (weekly or bi-weekly status updates) to discuss progress, address queries, and make decisions. These meetings help maintain transparency and keep all stakeholders informed.
Documentation: Detailed documentation, including project requirements, specifications, and progress reports are shared and updated regularly. This ensures all parties have a common reference point and can track progress effectively.