Everything about Sip Registrar totally explained
An SIP registrar is a server in an
Session Initiation Protocol (SIP) network that accepts SIP REGISTER requests. Although SIP endpoints can connect to each other without any additional SIP infrastructure, that isn't practical since each endpoint would need to know each others IP-address. The SIP registrar is a location service which registers a number of IP-addresses to a certain
URI, usually a "sip:" address but other types are also possible such as "tel:". More than one
User agent can register on the same address, with the result that all registered user agents will ring when called on that address.
Registrars in SIP are only logical elements and are commonly co-located with SIP proxies. But it's also possible and often good for network scalability to push this location service into a redirect server instead. A redirect server will consist of a
user agent server handling incoming INVITEs and responding to them with a 301 (Moved Permanently) or 302 (Moved Temporarily) response if a user has been registered on the requested
URI.
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