SIP trunks use the internet to transmit voice, video, and other multimedia communications. They connect a business's private branch exchange (PBX) to the internet, enabling communication with external parties, such as customers, partners, and suppliers, using IP-based networks.

1. Cost savings: SIP trunks often cost less than traditional phone lines, especially for long-distance and international calls. 2. Scalability: SIP trunks are easily scalable, allowing businesses to add or remove channels as needed without physical infrastructure changes. 3. Flexibility: SIP trunks support various communication methods, including voice, video, and instant messaging, providing flexibility for modern communication needs. 4. Disaster recovery: SIP trunks can be rerouted quickly in case of emergencies or disasters, ensuring business continuity.

To use SIP trunks, you'll need an IP-enabled PBX system or a session border controller (SBC) to manage the communication between your internal network and the SIP trunk provider's network. You'll also need a reliable internet connection with sufficient bandwidth to support your communication needs.

Yes, in most cases, you can port your existing phone numbers to SIP trunks. This process, known as number porting, allows you to retain your current phone numbers while switching to SIP trunks.

SIP trunking can be secure if proper security measures are implemented, such as encryption, authentication, and firewall protection. Working with a reputable SIP trunk provider that prioritizes security is essential for safeguarding your communications.