DID numbers provide 10 key benefits for businesses: 1) Efficient handling of high call volumes, 2) Establishing a memorable corporate identity, 3) Enabling a global local presence, 4) Enhancing communication between office and remote teams, 5) Measuring marketing attribution and effectiveness, 6) Flexibly buying and discarding numbers as needed, 7) Protecting privacy of mobile workforces, 8) Facilitating 24/7 global support, 9) Reducing communication costs, and 10) Unifying call management. DID numbers allow businesses to distribute incoming calls across multiple lines, establish credibility through vanity numbers, provide local contact numbers globally, and streamline communications internally and with customers.