How to integrate IP telephony with landline and mobile numbers?

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Using VoIP gateways:
VoIP Gateway : A device that connects an IP PBX to traditional telephone lines.
Connecting to Landline Numbers: A VoIP gateway connects to analog or digital lines provided by your telephone company and converts voice traffic into IP format.
Connecting to mobile numbers: VoIP or GSM gateways also support connecting SIM cards for integration with mobile networks.
Using SIP trunks:
SIP Trunk : A virtual communications channel provided by a VoIP provider cameroon email list that connects an IP PBX to the PSTN telephone network.
Connection to city numbers: SIP trunk allows you to receive and make calls to city numbers via the Internet, without the need for a physical connection.
Connecting to mobile numbers: SIP trunk can also be used to integrate with mobile networks via a VoIP provider.
Direct connection via VoIP provider:
VoIP Provider: An Internet telephony service provider that provides connections to landline and mobile numbers.
Connecting to landline numbers: VoIP providers often offer services to port landline numbers to their platform.
Connecting to Mobile Numbers: VoIP providers may offer mobile number portability services or provide virtual mobile numbers.