e/SIP registrar

Information
has gloss	eng: A SIP registrar is a server in an Session Initiation Protocol (SIP) network that accepts and processes SIP REGISTER requests. The SIP registrar provides a location service which registers one or more IP addresses to a certain SIP URI, indicated by the sip: scheme, although other protocol schemes are possible (such as tel:). More than one user agent can register at the same URI, with the result that all registered user agents will receive a call to the SIP URI.
lexicalization	eng: SIP registrar
instance of	e/Session Layer