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H.323 vs. SIP

H.323 vs. SIP. By Stephen Tomko. Internal PBX Call. Extension number is dialed PBX receives extension Routes extension Routes call to the phone Call begins. Internal VoIP Call. Extension number is dialed Server picks up extension Tells phone how to reach the other phone via IP

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H.323 vs. SIP

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  1. H.323 vs. SIP By Stephen Tomko

  2. Internal PBX Call • Extension number is dialed • PBX receives extension • Routes extension • Routes call to the phone • Call begins

  3. Internal VoIP Call • Extension number is dialed • Server picks up extension • Tells phone how to reach the other phone via IP • VoIP phone establishes a connection to the other phone • Via TCP/IP protocol stack • Uses network mediums • Both confirm connection and call begins

  4. Difference? • Extension is still dialed • Call is still placed • Still routed • Call quality is equal

  5. Convergence • Data, voice, and video are all combined under one medium • Many reliable mechanisms to provide reliability, security, and manageability already exist • TCP, RTP, QoS params • SSL, SSH, S-HTTP

  6. How we handle calls • VoIP, Video, and data must have sessions • Sessions need protocols • Think SS7 for landline • Two largest protocols • SIP • H.323

  7. SIP Background • Created by the Internet Engineering Task Force (IETF) as a method to control “sessions” between one or many points • February 1996 • Designed around the HTTP protocol • Session Codes • E.g. 400 – user error, 500 – server error, etc…

  8. H.323 Background • Created by ITU-T as a method to control voice, audio, and data • November 1996 • A Suite of protocols • H.225 • H.235 • H.245 • Derived from Q.931 standard • Think PSTN and ISDN signaling

  9. SIP Components • User Agent Client • Creates and sends requests • A SIP compatible phone is a User Agent doing the work of a User Agent Client • Registar/Location Server • Registers User Agents • Stores locations • Address resolution • (SIP:user2209@statefarmIT) • User Agent Server • Accepts, Forwards and routes calls • Proxy Server • Routes calls • Redirect Server • Multifunctioned • Discussed Later

  10. H.323 Components • Terminal • Standard VoIP phone or any device that starts or terminates H.323 sessions • Gateway • Translates data from one incompatible network to another • Think PSTN to Ethernet • Gatekeeper • Controls calls and sessions • Address resolution • Zone control • Bandwidth control • Multipoint Control Unit • Bridges many sessions into one

  11. Sip Proxy Mode pulver.com nortel.com jeff.pulver pulver@von1 user@nortel.com pulver@von1 Proxy server 1. INVITE sip:jeff.pulver@pulver.com SIP/2.0 From: sip:user@nortel.com 2. INVITE sip:pulver@von1 SIP/2.0 From: sip:user@nortel.com 3. SIP/2.0 200 ok From: sip:pulver@von1 Location Server 4. SIP/2.0 100 OK From: sip:jeff.pulver@pulver.com 5. ACK sip:jeff.pulver@pulver.com SIP/2.0 From: sip:user@nortel.com 6. ACK sip:pulver@von1 SIP/2.0 From: sip:user@nortel.com

  12. Sip Redirect Mode pulver.com nortel.com pulver@von1 Jeff.pulver user@nortel.com Pulver@von1 Redirect Server Location Server 1. INVITE sip:jeff.pulver@pulver.com From: sip:user@nortel.com 4. INVITE sip:pulver@von1.pulver.com From: user@nortel.com 5. SIP/2.0 200 OK To: user@nortel.com 2. SIP/2.0 320 Moved temporarily Contact: sip:pulver@von1.pulver.com 6. ACK sip:pulver@von1.pulver.com From: sip:user@nortel.com 3. ACK sip:jeff.pulver@pulverr.com From: sip:user@nortel.com

  13. H.323 Process Extensive • H.225 – Call signaling • Provides call signaling, alerting, and connected statuses for the call in question • RAS Signaling • Communication between terminals and gatekeepers • Communication between gatekeepers • H.245 • Capability negotiation • Defines what codecs to be used for audio/video/data • H.264, G.729, T.140 • Master/Slave determinator • Settles all disputes between two devices during negotiation • H.235 • Encryption using SSL

  14. H.323 vs. SIP • http://www.microtronix.ca/sip_vs_h323.htm

  15. Business Value • Converging data/voice/video under one medium - network • Control how your business communicates • Multipoint conferencing • Unified communication allows all types of communication under one protocol • All in one package

  16. Why technology is important • One word: Convergence umbrella • Geographic locations are reduced • H.323 • All-in-one suite, managers many facets • SIP • Simplicity, small, modularity

  17. Major Commercial products • Nortel’s Application Server 5300 for SIP • http://products.nortel.com/go/product_content.jsp?segId=0&catId=null&parId=0&prod_id=66621&locale=en-US • Avaya Aura for SIP • http://www.avaya.com/usa/product/avaya-aura#%20Avaya%20Aura%E2%84%A2%20Communication%20Manager • Cisco UT Communications Manager (CallManager) for H.323/SIP • http://www.cisco.com/en/US/products/sw/voicesw/ps556/

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