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SIP vs H323 Over Wireless networks Presented by Srikar Reddy Yeruva Instructor Chin Chin Chang.
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Transcript of SIP vs H323 Over Wireless networks Presented by Srikar Reddy Yeruva Instructor Chin Chin Chang.
SIP vs H323 Over Wireless networks
Presented by Srikar Reddy Yeruva
InstructorChin Chin Chang
Voice Over Internet Protocol
VOIP protocols: H.323
SIP (session initiation protocol) MEGACO (circuit switched to packet switched)
MGCP (media gateway control protocol)
TWO Famous Protocols: SIP
H.323
H 323
Defined by ITU-T (international telecommunication union)
H323 uses:
Terminal gateway
Gate keeper
H 323 basic architecture
There are different features:
Local features: II type features: III type features
Repeat a call with gate keeper Signaling Call list call admission call transfer local address book Authorization call completion Speed dialing call detail recording call forwardingMute …..etc number suppression call hold
H323 VS SIP
H.323 is the more mature of the two, but problems may arise due to lack of flexibility.
SIP is currently being defined in a
robust way and has greater scalability which could ease internet application integration.
H-323 The type III functionality is split by h323 by
many protocols This makes it more complex while taking
over from one protocol to another. Every function has its own protocol. But has many functions than SIP like: Message waiting indication Name identification Call offer Call intrution
Definition of SIP SIP was defined in 1999 by IETF’s MMUSIC
to provide a mechanism to allow voice data and video integration
SIP provides the foundation for building converged networks that support seamless integration with traditional voice networks, email, the World Wide Web, and next-generation technologies such as instant messaging and 3rd Generation Partnership Project (3GPP) mobile networks.
SIP- Components
SIP user agent
SIP proxy server
SIP redirect Server
SIP registrar server
An Integrated Communications Scenario
SIP (session initiation protocol)
Build a network
Sip global distance call includes many technologies
includes H.323, sip,ss7 etc….
Ip phone
Sip service delivery architecture
Security H323:Defines security mechanisms and
negotiation facilities via H.235, can also use SSL for transport-layer security.
SIP: Http like encryption Cryptographically secure authentication
and encryption is supported hop-by-hop via SSL/TSL, but SIP could use any transport-layer or HTTP-like security mechanism, such as SSH or S-HTTP.
Billing
H323: Direct call model, endpoint reports to the gatekeeper
SIP: Proxy gets the billing information the proxy has to stay in the calling
signal path to detect when the call ends
call signaling could be delayed
ADDRESSING
H323: Flexible addressing mechanisms,
including URLs and E.164 numbers.
SIP: SIP only understands URL-style
addresses
multimedia H.323 fully supports video and data
conferencing. Procedures are in place to provide control for the conference as well as lip synchronization of audio and video streams
SIP: SIP has limited support for video and no
support for data conferencing protocols like T.120. SIP has no protocol to control the conference and there is no mechanism within SIP for lip synchronization
References Microtronix systems ltd http://microtronix.ca/sip_vs_h323.htm Tmcnet http://www.tmcnet.com/it/0801/0801radv.htm iptel.org http://www.iptel.org/info/trends/sip.html Cisco corporations www.cisco.com
QUESTIONS???????????
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