The VoIP Report displays … SIP Trunking 101 SIP Trunking is a telecommunications circuitthat uses IP engineering to oust traditional PSTN cabling. The implement of SIP trunkingis increasing while the use of T-1 orders is on the deterioration. SIP trunking furnishes accessto VoIP assistances, and gives organizations a wide range of benefits by streamlining infrastructurerequirements