43 Komponen H.323 H.323 Gateway H.323 Gatekeeper Interface H.323 terminal – WAN terminal.H.323 GatekeeperAddress Translation (E.164 – IP)Admission Control. Authentication.Bandwidth Control.Zone Management.Call Control & Management(e.g. VoIP – PSTN)
44 H.323 GatewayOptional!Translation function between H.323 conferencing endpoints and other terminal types.Translation between transmission formats (i.e. H to H.221).Translation between communications procedures (i.e. H.245 to H.242).Translation between audio and video codecs.Performs call setup and clearing on both the LAN side and the PSTN side.
46 GatekeeperThe most important component asct as a virtual switch of an H.323 enabled network.It acts as the central point for all calls within its zone and provides call control services to registered endpoints.
47 GatekeeperAddress translation from LAN aliases for terminals and gateways to IP or IPX addresses (e.g E.164 – IP)Bandwidth management.Route H.323 calls.Bill for calls.
49 Isu Quality of Service (QoS) Kekurangan BandwidthDelay terlalu lama.Jitter / Variasi delay.
50 QoS Resource Reservation Protocol (RSVP) Real Time Protocol (RTP) Compressed Real Time Protocol (CRTP)Traffic ShapingQueuing: Custom Queuing, Weighted Fair Queuing.Congestion Control: Random Early Detection.Effisiensi Jaringan: link fragmentation & interleaving.
51 Metoda Kompresi Kompresi Kbps MIPS ms MOS 64 0.34 0.125 4.1 32 14 3.85 G.711PCM640.340.1254.1G.726 ADPCM32143.85G.728 LD-CELP16330.6253.61G.729 CS-ACELP820103.92G.729 x2 Encoding3.27G.729 x3 Encoding2.68G.729a CS-ACELP10.53.7G MPMLQ6.3303.9G ACELP5.33.65
73 Hierarchical WAN Design the network must support and supply the prerequisite QoS features.Hierarchical model to allow the most cost-effective platforms.As the requirements for data traffic outstrip those of voice, voice bandwidth decreases & lowering costs.WAN links to support the minimum requirements for data + voice and video. When other applications are quiescent, the bandwidth is available for data.
85 QoS Campus NetworkThe primary concern is buffer management and the ability to provide the required queuing schemes to ensure voice gets the appropriate bounds for loss, delay, and jitter.
86 QoS – Strategies Classification is a key attribute. Queuing techniques.Buffer management is also used to ensure that excess jitter is not added for voice traffic.To combat this, the multilayer LAN switches provide either two queues or a single queue with definable drop thresholds to bound delay.
87 ApplicationIP TelephonyUnified MessagingIP Contact Center