VoIP Cookbook: ENUM
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ENUM is basically a mapping mechanism to map Telco number, such as, +628113334567 or +62555334567, to a number recognize in VoIP network such as, 20333@voiprakyat.or.id or 5007987@fwd.pulver.com. Thus, in principle, ENUM is merely a table.
ENUM is not limited to mapping only. ENUM recognize prioritizing. For example, a phone number +6255534567 may have several client with priority, such as,
+6255534567 priority 1 245678@voiprakyat.or.id +6255534567 priority 2 6543686@fwd.pulver.com +6255534567 priority 3 +62215678976 (nomor kantor) +6255534567 priority 4 +62856789654 (nomor handphone) +6255534567 priority 5 mail:oknum@salemba.co.id
The actual writing of ENUM on the Internet, for example using the top level domain e164.id, is as follows,
+6255512345678 8.7.6.5.4.3.2.1.5.5.5.2.6.e164.id +6281812345678 8.7.6.5.4.3.2.1.8.1.8.2.6.e164.id
Please note that the ENUM number is reversed as oppose to the known normal phone number.