|
FEATURES |
H.323 |
SIP |
|
Standards Body |
ITU (International Telecommunications Union) |
IETF (Internet Engineering Task Force) |
|
Origins |
Telephony-based |
Internet-based |
|
Quality of Service |
Bandwidth management and mission control managed by H.323 gatekeeper |
SIP relies on other protocols like RSVP, COPS and OPS to implement QoS |
|
Security |
Registration: Endpoints register and request admission with gatekeeper.
Authentication and encryption: H.323 provides recommendations for authentication and encryption in H.323 systems. |
Registration: Uses agent to register with proxy server.
Authentication: User agent authentication uses HTTP digest or basic authentication.
Encryption: SIP defines three methods of encryption for data privacy. |
|
Endpoint Location |
Uses #.164 or H.323ID alias and an address-mapping mechanism if gatekeepers are present in the H.323 system |
Uses SIP URL for addressing |
|
Call Routing |
Gatekeeper provides routing information |
Redirect or location servers provide routing information |
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