
12
SIP: basic operation
1. use directory service (e.g., LDAP) to map name to user@domain
2. locate SIP servers using DNS SRV, CNAME or A RR
3. called server may map name to user@host using aliases, LDAP,
canonicalization program, . . .
4. callee accepts, rejects, forward (
new address)
5. if new address, go to step 2
6. if accept, caller confirms
7. ...conversation...
8. caller or callee sends BYE
Also, tel:, h323: URLs
outbound proxy maps to gateway
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