Voice over WiMAX
Wireless VoIP with a Difference
WiMAX gives network providers the opportunity to provide a wealth of services that they can use to differentiate their offerings and attract a tiered range of subscribers. A variety of flow types optimize performance for voice, data, and video. Voice/data/video convergence makes sense for enterprises and network providers alike. Effective voice over IP (VoIP) communications require QoS features that can quickly identify voice traffic and prioritize it to assure high-quality audio and service level adherence. Aperto's patented flexible VoIP classifier systems have made Voice over WiMAX the "killer app" for this technology.
Intelligent Overbooking. Aperto's earlier generation products have fully supported Constant Bit Rate (CBR) services specifically designed to handle VoIP, Time Division Multiplexing over IP (TDMoIP), and other delay-sensitive traffic by maximizing capacity on the channels. The 802.16 Unsolicited Grant Service feature implemented in PacketMAX reinforces the benefits of CBR, allowing network providers to overbook bandwidth to make better use of resources.
Flexible Packet Classifiers. Any field in layers 2, 3, or 4 of packet headers can be used to identify VoIP packets for QoS treatment. Plus, the PacketMAX system can use DiffServ Type of Service (ToS) bits and VLAN 802.1p protocols to establish priorities.
IP Address Conservation. Aperto's products integrate Network Address Translation (NAT) and Port Address Translation (PAT) protocols with VLAN and bridging technologies to conserve IP addresses for non-VoIP devices, and to provide direct IP addressing for incoming VoIP calls. This means that only two IP addresses are needed for as many as 254 hosts, while incoming calls get a direct IP address without special devices or services.
Fast Activation/Deactivation. PacketMAX systems feature the ability to activate and deactivate VoIP sessions very rapidly, another aid to bandwidth overbooking.
Payload Header Suppression. Also new to PacketMAX is a feature called Payload Header Suppression (PHS) that helps optimize bandwidth usage by tightly integrating VoIP protocols in order to boost efficiency.
Powerful Processing. The PacketMAX product line increases the processing power available to the system, making it possible to transmit wireless VoIP traffic at full line rates for better performance. PacketMAX 5000 processing capabilities support a total of up to 10,000 simultaneous VoIP calls.
Simplified Configuration. Telephony setup and configuration is easy to accomplish with PacketMAX: the administrator just selects the encoding standard and number of calls to be processed. The system is designed to gracefully accommodate new standards in the future.