Microsoft Response Point (SP1) is a VoIP phone system software designed especially for small businesses by Microsoft. Its Easy to use, Voice-Enabled, Unique and Friendly user interface, Easy to manage, and Easy to grow. Response Point is the easy choice to fulfill your business phone system needs in one affordable package. Microsoft Response Point Products: Syspine Digital Operator System DOS-A50 Base Unit with ATA, Security Gateway options, IP Phone 310, AastraLink RP, and Aastra phone sets 6757i CT RP, 6753i, and 6751i. You can also mix and match Syspine and Aastra Response Point Phones such as 6751i RP, 6753i RP, 6757i CT RP phones for a cordless operation.