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**PRI (Primary Rate Interface)**: PRI is a channelized digital trunk service connecting a PBX or key system to the Public Switched Telephone Network (PSTN), providing 24 channels (23B + 1D) on a T1 interface. It offers cost savings compared to analog trunks, uses digital technology for better security and fault tolerance, and is a worldwide standard supported by all PBX manufacturers. Features include two-way trunks and Caller ID, with faster call set-up times using D channel out-of-band signaling. **SIP Trunking**: SIP Trunking connects existing PBX systems to a data network via VoIP, utilizing existing Ethernet/fiber connections. It allows dynamic bandwidth allocation, supports on-premises equipment, consolidates voice and data resources, and increases voice traffic using compression technology.