
What's the Client/Caller Name? - Always get the caller's name spelled correctly and note down.
What's the company name? - Always get the company name spelled correctly. If an active client you can do a quick search in CRM
Who called from that company? - Position he/she holds within the organization.
Location (Country) ? Specially for a prospect
What's their contact number/email or the call-back number? Make sure you have the correct contact details. Always read back to the caller to verify the given details
What's the purpose of the call? Very important to know those before you take any action relevant to the call received.