What are the disadvantages of SIP?
1) Potential decrease in call quality when bandwidth is saturated
2) May have problems connecting disparate phone systems
3) Newer technology (not tried and true like T1/PRI)
4) Lack of features for endpoints
5) Vulnerable to eavesdropping
6) Vulnerable to registration and hijacking (steal the number)
7) Traditional firewalls don’t protect
8) Toll fraud
9) Audio injection (hacker adds noise)
10) Not available everywhere like a T1/PRI
11) SPIT – Spam over internet telephony
12) Can expose to unacceptable content or offensive language
13) Hackers can make calls for you
