SIP, which some experts believe is a key consideration when selecting a VoIP vendor for the call center, stands for:
a) Secure Internet Program
b) Strictly Internal Phone
c) Session Initiation Protocol
d) Speech Imitation Program
SIP (Session Initiation Protocol) is based on RFC 2543 (Ref. 3) and is an application layer signaling protocol, according to a resource on SearchVoIP.com. It deals with interactive multimedia communication sessions between end users, called user agents. It defines their initiation, modification and termination.