The PNB10 is a PSTN box designed for regions still relying on the Public Switched Telephone Network (PSTN). This device enables IP phones to support both SIP-based VoIP calls and traditional PSTN communication. Simply connect the PNB10 to your IP phone using an existing PSTN cable in your office or meeting room for seamless integration. Featuring HD audio quality, full-duplex speakerphone, and advanced acoustic shield technology, the PNB10 ensures clear and natural sound. It also offers a range of practical features such as USB call recording, enhancing your communication experience with reliable performance and exceptional voice clarity.