Phone and Video Call Phrases

Teach me phone and video call phrases in [TARGET LANGUAGE].

Context: [PERSONAL/BUSINESS/BOTH]
My level: [LEVEL]

Please provide:
1. Answering calls:
   - Formal greetings
   - Informal greetings
   - Identifying yourself

2. Making calls:
   - Asking for someone
   - Identifying yourself
   - Stating purpose

3. During the call:
   - Asking to repeat
   - Asking to speak slower
   - Confirming understanding
   - Asking for spelling
   - Putting on hold
   - Transferring calls

4. Technical issues (video calls):
   - Audio problems
   - Video problems
   - Connection issues
   - Screen sharing language

5. Taking messages
6. Leaving voicemails
7. Ending calls politely
8. Call-back arrangements
9. Video call etiquette phrases
10. Emergency call phrases
11. Practice dialogues:
    - Personal call
    - Business inquiry
    - Appointment scheduling

12. Common phone abbreviations and terms
13. Cultural notes on phone etiquette