ZyXEL Communications P-2000W V2 - Manual (Page 6)

P2000W V2 Troubleshooting Guide
All contents copyright (c) 2005 ZyXEL Communications Corporation.
6. What is the difference between H.323 and SIP?
H.323 and SIP are proposed by different group
Session Initiation Protocol (SIP) is a standard introduced by the Internet
Engineering Task Force in 1999 to carry voice over IP. Since it was created
by the IETF, it approaches voice and multimedia from the Internet, or IP,
perspective of view. Where as H.323 emerged around 1996, and as an
International Telecommunication Union standard it was designed from a
telecommunications perspective. Both standards have the same objective - to
enable voice and multimedia convergence with IP protocols.
7. Can H.323 and SIP interoperate with one another?
In interoperability between the two, the industry is making slow but sure
progress. Interoperability must first happen between vendor implementations
of the same protocol (SIP-to-SIP and H.323-to-H.323) and then between
protocols. Currently in order for SIP client to talk to H.323 client the ITSP
must have a trunking gateway act as a translator between the two protocols
without the truncking gateway the two protocols are not able to communicate
to one another.
8. What do I need in order to use SIP?
The minimum required to use VoIP is as follow.
1. A high-speed Internet connection. This can be a cable modem, or a high-
speed network services such as ISDN, DSL or a T-1 link. The need of
the bandwidth required will depend on the amount of telephone traffic will
be in your network.
2. A PC with VoIP software installed or a hardware VoIP box such as ATA
or device like P2000W V2.
3. An account with a VoIP provider such as an ITSP. The account can be
configured to recognize your calls automatically, or you can require the
users to enter their unique account numbers issued.
9. What is voice quality?
Voice quality is how well a person can hear the voice on the opposite end.
10. How are voice quality normally rated?