Dialogic 6.2 - Manual (Page 255)

Understanding the SIP Protocol
November 2009 255
Registrations are one way to create this information, but not the only
way. Arbitrary mapping functions are configured at the discretion of
the administrator.
Finally, it is important to note that in SIP, registration is used for
routing incoming SIP requests and has no role in authorizing
outgoing requests. Authorization and authentication are handled in
SIP either on a request-by-request basis with a challenge/response
mechanism, or by using a lower layer scheme.
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