How does SIP work with example?

Related questions

1. Can VoIP call landlines?
2. What is difference between PBX and IP PBX?
3. What is a SIP phone number?
4. What is the advantage of IP phone?
5. What is the main use of VoIP?
6. Do you need special phones for VoIP?
7. What is cloud phone system?
8. How does a VoIP call work?
9. What is PSTN used for?
10. Can VoIP calls be traced?

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24. #debited