Mitel Semiconductor, a division of Mitel Corporation announced a complete chipset that delivers industry-leading voice quality to enterprise-level Voice over Internet Protocol (VoIP) systems. Mitel's IP phone solution includes a phone controller, dual codec and 10/100 Ethernet PHY, as well as all of the required software protocol.

The MT92101 phone controller is a multi- core, system-on-a-chip that handles protocol stack management and DSP packet processing algorithms. The IC integrates the ARM7TDMI RISC CPU, the OAKDSP and a full 801.1p 10/100 Ethernet Bridge to enable quality of service in IP telephone solutions.
The MT92303 is a full-featured dual-codec with drivers for handsfree, speakerphone, handset and line operation. The highly integrated device requires no external components, substantially easing implementation and reducing cost.
The MT933 is a single-chip, 3.3V CMOS physical layer solution for 10/100BASE-T Ethernet. The low-power device is compatible with the auto negotiation section of IEEE802.3u, and provides all of the functionality required of full-duplex operation.

To provide privacy on the IP network, the MT92101 employs on-chip hardware acceleration to implement the DES or IP Sec. Alternative, software-based approaches place unnecessary demands on CPU processing power, and increase the total MIPs required. Compared to these software-based approaches, Mitel's IP Telephone chipset provides a 100x performance improvement.

Additional flexibility is provided with a second PCM port that facilitates linkage to TDM switches, modems and other connectivity devices.

The MT92101 integrates an Ethernet bridge that employs QoS features for each network layer. At the desktop, the Ethernet bridge prioritizes phone traffic before PC traffic. At layer 2 of the network, the Ethernet bridge driver sets the 802.1p tag in the packet to ensure recognition when the destination does not understand the header. In layer 3 of the network, a differential-services code point can be configured via signaling protocols, management protocols or manually.

The chipset includes all of the signaling stacks required for IP telephony applications. Mitel has developed a fully interoperable SIP signaling stack. Mitel also supports H.323 and Media Gateway Control Protocol (MGCP) stacks from RADVision, Inc. The H.323 core protocol permits the creation of real-time voice calls over IP networks. RADVision's suite of MGCP building blocks separate signaling, call control and media internetworking into separate, logical entities.