The user may include any number or textual address assigned to him or her in a legacy network into his or her personal address set. This allows the user to stay available at legacy addresses, which he or she used earlier (Fig. 12) not only at SI addresses. It worth noting that owner of such a legacy address may receive calls from legacy communication devices as well as from SI-enabled ones.
Fig. 12. Availability at legacy addresses.
Similarly, the SI technology allows easy usage of fixed legacy addresses for outgoing calls from SI users (Fig. 13). This is so because SI address database may also incorporate fixed addresses assigned by legacy communication systems following their respective addressing rules. These addresses act as ordinary SI addresses for which, for example in case of phone numbers, a readiness to receive a call is permanently set on.
Fig. 13. Calling legacy addresses.
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