pbxnsip, Inc. is a leader in SIP based IP-PBX software systems for Microsoft Windows, Linux, and OEM environments. Phone systems running pbxnsip software can scale from as few as 10 extensions to as many as a 1000 extensions in local and hosted modes. With high-end features like End-to-End Security using SIPS / SRTP, a built-in Session Border Controller, and integration with Microsoft Exchange, pbxnsip is building phone systems that offer great value to SMB customers.
