1.Does SIP support the standard
telephone features?
2.How does SIP support caller ID?
3.Should SIP be used to join a
conference from a web page?
4.Can a SIP-initiated session have
zero or one participants?
5.How do I charge/bill for Internet
telephony using SIP?
6.How do prepaid calling cards
work in SIP?
7.Does SIP carry DTMF?
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