IP-Phone solution 2 nd Workshop on Wideband Speech Quality in Terminals and Networks: Assessment and Prediction 22 nd and 23 rd June 2005 – Mainz, Germany : A Wideband capable Vo. IP Chipset called INCAIP “Aspects of Wideband Speech Quality as seen by the Customer System Engineering” Frank Meier, Infineon Technologies frank. meier@infineon. com Never stop thinking.
INCA-IP: Converging from a Single Chip to a Complete System
INCA-IP: Hardware Overview
INCA-IP: Analog Front End n Analog Front End fully integrated no external amplifier necessary n Design proven in INCA-P n 3 Different Inputs Handset Microphone Headset Microphone Handsfree Microphone n 3 Different Outputs Handset Speaker Headset Speaker Handsfree Speaker n AFE is Wideband capable
INCA-IP: Digital Signal Processor n Full Duplex Speakerphone with Noise suppression n Handset echo control (Normal handset only achieves 45 d. B, ITU spec. 60 d. B) n Enhanced full duplex handsfree speech for G. 722 n Voice Coding/Compression n Automatic Gain Control - G. 711 n Caller-ID Transmitter - G. 723. 1 n Speech Recognition (DTW) - G. 729 A/B n Tone Generation for Ringing and DTMF - G. 722 - G. 726 n 3 -Party conferencing with mixed coders
INCA-IP: CPU subsystem n SDRAM Controller n Cache Controller n 4 k I-Cache and 4 k D-Cache (2 way set associative) n Memory Management Unit prepared for any OS n Clock generation unit n Advanced power management n Clock speed up to 150 MHz n Interrupt arbitration in parallel to CPU operation n Subsystem is reused from other projects n Optimized bus architecture for maximum bandwidth n MIPS 32 4 Kc. TM RISC CPU
INCA-IP: Compact and Standard Version n Same hardware concept for Compact, Entry, Standard and Office Phone n Same package and pin-out n Software synergy for both chips
INCA-IP: Tools n INCA-IP Tool Package – Demonstration Board – Software Package – Documentation – Accessories n Demonstration Setup – Voice over IP connection – Different Voice Codecs – Full Duplex Speakerphone – Complete IFX Vo. IP Phone Software available
INCA-IP: Complete SW Solution (1) • Fully integrated IP Phone software solution • Based on open source LINUX OS • Telco grade, toll quality performance • Extensive Qo. S support • High-level, user friendly APIs • Standard Networking Support (IPv 4, TCP, UDP, ICMP, ARP) • Web-based management, SNMP • Remote Upgrade Capabilities • SIP (RFC 3261, RFC 3265, RFC 3515, RFC 3264, RFC 2782 and RFC 3428) • SDP(RFC 2327) • RTP/RTCP (RFC 3550) • Secure RTP (RFC 3711) • Adaptive Jitter buffer • DHCP option for SIP (RFC 3361) • DNS support for SIP
INCA-IP: Complete SW Solution (2) n Three-way conferencing n Voice activated dialling n Volume control n Codec selection n Loudhearing/handsfree/headset selection n Address book n Instant messaging n Call on hold n Call waiting n Call forward n Call transfer n Call blocking (do-not-disturb)
SW Stack
SW Interop Lab n Fully automated – automatic dial – ring detection – bidirectional voice detection – RTP stream capturing – etc. n Automatic report generation n More than 35 competitor phones included
Overall Problems with WB Typical problems that occured during development of the INCA-IP system and that have been recorded by the Infineon customer system engineering: n End user acceptance is still very low („sounds strange“) – they are used to phones that sound like a phone n The vendor´s acceptance is medium but priority to switch over to WB is low („We have planned it for one of our next phones…“) n Codec Situation is unclear (G. 722, G. 722. 1, G. 722. 2, … ? ) n Knowledge about codecs and SW at all of system vendors decreases new tasks for us
Possible Blocking points for the acceptance of WB n Still unsolved problems – The „perfect“ Codec is needed (One Codec for Low Bitrate up to High Quality) – Quality of the lower frequencies (Speaker, Mic, Housing) n Guaranteed Bandwidth / Qo. S in the WAN/Internet – Home User: Absolute Low Cost, Telephone „For Free“ – Professional User: High Quality, Reliability, Availability – Both: Additional costs have to be low! n Missing Infrastructure, Today WB is usually an isolated Solution, e. g. inside a Company Network – Telecom Provider need should push the Usage of WB n Interop not tested or not even wanted by all vendors – „POTS phones are always compatible“
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