Short for session initiation protocol for business (SIP for Business) is a SIP-based protocol which allows advanced SIP features to be adopted for business telephony networks. SIP for Business does not modify the SIP standard in any way (nor does it propose any extensions or modifications to the SIP standard). It is a series of standard SIP-based call flows. The SIP-B initiative was developed by Sylantro Systems in consultation with Siemens, Polycom and Citel Technologies.
See also SIP.