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Options Numbers (tel:911;context=+1): about 60, some used for non-emergency use tel:sos not a “real” tel URI requires universal deployment SIP URL parameter: sip:example.com;user=sos not backwards compatible not really a user Special domain: sip:fire@sos.int valid URL needs support infrastructure (DNS, proxy) for that domain SIP user: sip:sos@example.com backward compatible only needs home proxy to work violates proxy behavior rules: non-domain proxy may attempt mapping overloads user name but postmaster/webmaster has worked pretty well for email a service URN (see later) avoids confusion and overloading works for protocols other than SIP needs more UAC changes |