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Which Public Identifiers? There are the following choices: E.164 numbers SIP AoR in the format sip:user@foo.bar or both (e.g. sip:+43123456@foo.bar) If it is E.164 numbers only, these E.164 numbers are translated by some magic (e.g. ENUM) to internal identifiers e.g. a SIP AoR to enable routing. Note: This ENUM cannot be USER ENUM because if the carriers services rely on this mapping, it must be independent from the end-user. If it is SIP AoRs, an additional question comes up: is an end-user restricted to public identifiers given out by providers such as richard.stastny@vodafone.de or is it possible also to "port in” identifiers such as richard@stastny.com? |