Difference between H.323 and SIP
H.323 :
H.323 is a standard for real-time audio and video conferencing over the Internet. H.323 also specifies how end system are attached to Internet by circuit switched telephone network.
SIP :
Session Initiator protocol describes establishment, management and termination of multimedia session. Multimedia sessions can be Internet telephone call or video conferencing.
Difference between of H.323 and SIP :
H.323 | SIP |
---|---|
It is compatible with PSTN. | It is not compatible with PSTN. |
H.323 is not internet compatible. | SIP is internet compatible. |
It follows monolithic architecture. | It follows modular architecture. |
It uses Binary message format. | It uses ASCII message format. |
For Addressing purpose it uses Host or Telephone numbers. | For Addressing it uses URL. |
It does not support instant messaging. | It supports instant messaging. |
Large and complex Implementation. | Moderate Implementation. |
Designed by ITU. | Designed by IETF. |