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Ofono Open-Source Telephony oFono Open-source telephony R´emiDenis-Courmont Aki Niemi Nokia Devices R&D Maemo Software Maemo summit 2009 - October 10th 2009 R´emiDenis-Courmont Nokia oFono Outline 1 A brief history of Linux telephony 2 Nokia N900 3 oFono R´emiDenis-Courmont Nokia oFono A brief history of Linux telephony Nokia N900 oFono Outline 1 A brief history of Linux telephony 2 Nokia N900 3 oFono R´emiDenis-Courmont Nokia oFono voice calls Short Message Service (SMS) location supplementary services General packet radio service (GPRS) ... A brief history of Linux telephony Nokia N900 oFono What's (cellular) telephony? network status network selection SIM security (PIN, PUK. ) SIM phone book R´emiDenis-Courmont Nokia oFono A brief history of Linux telephony Nokia N900 oFono What's (cellular) telephony? network status network selection SIM security (PIN, PUK. ) SIM phone book voice calls Short Message Service (SMS) location supplementary services General packet radio service (GPRS) ... R´emiDenis-Courmont Nokia oFono designed in the seventies. originally for 300 bauds fixed serial line ASCII awkward multiplexing PPP (binary) for backward-compatibility A brief history of Linux telephony Nokia N900 oFono The standard (?) Hayes commands set ITU V.250 3GPP 27.007 better known as AT commands R´emiDenis-Courmont Nokia oFono awkward multiplexing PPP (binary) for backward-compatibility A brief history of Linux telephony Nokia N900 oFono The standard (?) Hayes commands set ITU V.250 3GPP 27.007 better known as AT commands designed in the seventies. originally for 300 bauds fixed serial line ASCII R´emiDenis-Courmont Nokia oFono A brief history of Linux telephony Nokia N900 oFono The standard (?) Hayes commands set ITU V.250 3GPP 27.007 better known as AT commands designed in the seventies. originally for 300 bauds fixed serial line ASCII awkward multiplexing PPP (binary) for backward-compatibility R´emiDenis-Courmont Nokia oFono Full replacement for AT commands, e.g.: Nokia: Phonet / ISI ST-Ericsson: CAIF PPP can be replaced too: proprietary framing Ethernet emulation A brief history of Linux telephony Nokia N900 oFono Besides the standard AT commands extensions: vendor-specific commands many implementations not fully adherent R´emiDenis-Courmont Nokia oFono A brief history of Linux telephony Nokia N900 oFono Besides the standard AT commands extensions: vendor-specific commands many implementations not fully adherent Full replacement for AT commands, e.g.: Nokia: Phonet / ISI ST-Ericsson: CAIF PPP can be replaced too: proprietary framing Ethernet emulation R´emiDenis-Courmont Nokia oFono OpenMoko: low-level D-Bus API Android Radio Interface Layer (RIL) NetworkManager: laptop-centric, AT-specific, IP-centric N900 CSD: Nokia modem-specific, closed A brief history of Linux telephony Nokia N900 oFono Existing solutions Qtopia: technology showcase for Qt R´emiDenis-Courmont Nokia oFono NetworkManager: laptop-centric, AT-specific, IP-centric N900 CSD: Nokia modem-specific, closed A brief history of Linux telephony Nokia N900 oFono Existing solutions Qtopia: technology showcase for Qt OpenMoko: low-level D-Bus API Android Radio Interface Layer (RIL) R´emiDenis-Courmont Nokia oFono A brief history of Linux telephony Nokia N900 oFono Existing solutions Qtopia: technology showcase for Qt OpenMoko: low-level D-Bus API Android Radio Interface Layer (RIL) NetworkManager: laptop-centric, AT-specific, IP-centric N900 CSD: Nokia modem-specific, closed R´emiDenis-Courmont Nokia oFono A brief history of Linux telephony Nokia N900 oFono Outline 1 A brief history of Linux telephony 2 Nokia N900 3 oFono R´emiDenis-Courmont Nokia oFono A brief history of Linux telephony Nokia N900 oFono N900 telephony architecture Telepathy Ring ICd Applications D-Bus IP stack PulseAudio CSD GPRS interface Phonet stack Phonet pipe Character dev McSAAB (Phonet device) CMT speech OMAP SSI driver SSI bus Cellular modem R´emiDenis-Courmont Nokia oFono 2.6.28: Phonet stack, GPRS, USB gadget 2.6.31: USB host driver same stack on N900 and PC! A brief history of Linux telephony Nokia N900 oFono Phonet simple datagram-based binary protocol multiplexing out of the box asynchronous notifications abstraction layer for modem interconnect one IP packet = one Phonet datagram R´emiDenis-Courmont Nokia oFono A brief history of Linux telephony Nokia N900 oFono Phonet simple datagram-based binary protocol multiplexing out of the box asynchronous notifications abstraction layer for modem interconnect one IP packet = one Phonet datagram 2.6.28: Phonet stack, GPRS, USB gadget 2.6.31: USB host driver same stack on N900 and PC! R´emiDenis-Courmont Nokia oFono A brief history of Linux telephony Nokia N900 oFono Outline 1 A brief history of Linux telephony 2 Nokia N900 3 oFono R´emiDenis-Courmont Nokia oFono A brief history of Linux telephony Nokia N900 oFono oFono architecture D-Bus oFono core stack Modem driver API Plugin API Generic AT driver Calypso driver ISI driver TTY Phonet stack R´emiDenis-Courmont Nokia oFono A brief history of Linux telephony Nokia N900 oFono oFono core stack Core: D-Bus (de)serialization network registration logic call handling logic SMS retransmit, format and parsing SIM phonebook to vCard conversion data caching ... Plugins: call history SMS storage R´emiDenis-Courmont Nokia oFono A brief history of Linux telephony Nokia N900 oFono oFono drivers hardware auto-detection modem message formatting/parsing plugin sub-layer for AT modem variants hardware-specific extra functions R´emiDenis-Courmont Nokia oFono A brief history of Linux telephony Nokia N900 oFono oFono vs CSD comparison D-Bus CSD plugins oFono core CSD oFono ISI driver Phonet stack OMAP SSI USB CDC-Phonet Cellular modem Nokia device R´emiDenis-Courmont Nokia oFono A brief history of Linux telephony Nokia N900 oFono References oFono project http://www.ofono.org/ Linux kernel http://www.kernel.org/ R´emiDenis-Courmont Nokia oFono A brief history of Linux telephony Nokia N900 oFono Any questions? R´emiDenis-Courmont Nokia oFono.
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