Intechnology's SIP trunking solution offers over 70% savings on ISDN costs by replacing conventional telephone lines with SIP trunks, enabling significant reductions in line rental and call charges. The system integrates seamlessly with existing PBX systems, allows for easy scalability, and supports functionalities like disaster recovery and remote working. Additionally, it provides business continuity features and the option to migrate to hosted IP telephony while maintaining current call routing policies.