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Functionally, SIP and H323 are similar, as shown in Table 7-21,8,9 Both protocols provide for call control, call setup, and teardown (with capabilities exchange) Both protocols provide basic call features such as call waiting, call hold, call transfer, call forwarding, call return, call identification, or call park Tables 7-3 and 7-4 provide additional comparisons between SIP, H323, and ISDN User Part (ISUP)10
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Table 7-2 SIP/H323 Protocol Comparison
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Standards body Origins
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H323 ITU Telephony based Borrows call signaling protocol from ISDN QSIG Intelligent H323 terminals H323 gatekeeper Widespread
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SIP IETF Internet based and web centric Borrows syntax and messages from HTTP Intelligent user agents SIP proxy, redirect, location, and registration servers Interoperability testing between various vendor s products is ongoing at SIP bakeoffs SIP is gaining interest SIP uses SDP for capabilities exchange SIP does not provide as extensive capabilities exchange as H323 Text-based Unicode Transformation Format-8 (UTP-8) encoding Stateless or stateful
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Client Core servers Current deployment
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Capabilities exchange
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Supported by H245 protocol H245 provides structure for detailed and precise information on terminal capabilities Binary ASN1 Basic Encoding Rules (BER) Session 1 or 2 stateful Version 3 or 4 stateless or stateful Bandwidth management Control and admission control is managed by the H323 gatekeeper The H323 specification recommends using RSVP for resource reservation Registration if a gatekeeper is present, endpoints register and request admission with the gatekeeper Authentication and encryption H235 provides recommendations or authentication and encryption in H323 systems
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Control channel encoding type Server processing QoS
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SIP relies on other protocols such as RSVP, Common Open Policy Service (COPS), and Open Settlements Protocol (OSP) to implement or enforce QoS
Security
Registration user agent registers with a proxy server Authentication user agent authentication uses HTTP digest or basic authentication Encryption the SIP RFC defines three methods of encryption for data privacy
Signaling Issues for Voice over MPLS
Table 7-2 (continued) SIP/H323 Protocol Comparison
Endpoint location and call routing H323 Uses E164 or H323 ID alias and an address-mapping mechanism if gatekeepers are present in the H323 system Gatekeeper provides routing information SIP
Uses SIP URL for addressing Redirect or location servers provide routing information
Conferencing
Comprehensive audiovisual Basic conferencing without conferconferencing support ence or floor control Data conferencing or collaboration defined by T120 specification H4501 defines a framework for supplementary service creation Supports flexible and intuitive feature creation with SIP using SIP-CGI and CPL Some example features include presence, unified messaging, or find me/follow me
Service or feature creation
Table 7-3 Service Comparison with ISUP
Services Call hold and retrieve Call transfer Call diversion Call park and pick up Call waiting Message waiting indication Terminal portability Conference calling Three party Call completion or busy subscriber Calling line ID presentation (CLIP)
SIP Yes Yes Yes Yes Yes No
H323 version 3 H4504 H4502 H4503 H4505 H4506 H4507 Notify
ISUP Q7332 Q7321 Q7322 Q7331
Q7334 Q7341 Q7342 Q7333 Q7313 Q7314 Q7315 Q7316 No
Yes Yes Yes Yes
Facility/setup/H245 Notify/facility/H245 H4509 H4508 H4508 H4508 H4508 Yes
Calling line ID restriction Yes (CLIR) Connected line ID presentation (COLP) Connected line ID restriction (COLR) Click for dial
Source: Trillium
Yes Yes Yes
Table 7-4 Feature Comparison with ISUP
SIP Lightweight 6 messages/ 37 headers H323 Complex H2550 signaling: 13 messages/ 263 IEs H225 RAS: 30 messages/303 IEs H245: 72 messages/127 IEs Binary encoding Voice, data, and video Different versions Signaling and bearer setup by different protocols H245 for capabilities exchange (rich protocol in expressing terminal capabilities) Scalable Admission (bandwidth control and management) control through gatekeeper Differentiated services support (bit rate and delay negotiation) 15 roundtrips using UDP, fast call, and no gatekeeper IP address, multizone, and multidomain support through gatekeeper (Annex G, border element) Zone management distributed gatekeepers Loop detection (path value) Complex, multiple protocols Security protocols (H235, IPSec, and TLS) Not easily extensible (NonStandardParam IE) Fault tolerance redundant gatekeeper and endpoints ISUP
Seven
Complex 44 messages/60 IEs
Text encoding Voice, data, and video Different versions Signaling and bearer setup by different protocols SDP for capabilities exchange (limited in expressing terminal capabilities) Highly scalable Not supported
Binary encoding Voice and data Different national variants Signaling and bearer setup by the same protocol ISUP IEs for capabilities exchange
Scalable Admission control through fallback procedures Dedicated circuit no QoS required 10 roundtrips E164 address, static
Not supported 15 roundtrips using UDP IP address and domain name resolution via DNS Distributed servers Loop detection (header via field) Firewall friendly Security protocols (IPSec, PGP, SSL, and HTTP authentication) Easily extensible (SIP require header) Not applicable
E164 address, static Loop detection (timer, hop count, and Loop message) Not applicable Physical security
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