ofono Open-source telephony Rémi Denis-Courmont Aki Niemi Maemo summit October 10th 2009 Nokia Devices R&D Maemo Software
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1 Open-source telephony Aki Niemi Devices R&D Maemo Software Maemo summit October 10th 2009
2 Outline 1 A brief history of Linux telephony 2 N900 3
3 A brief history of Linux telephony N900 Outline 1 A brief history of Linux telephony 2 N900 3
4 A brief history of Linux telephony N900 What s (cellular) telephony? network status network selection SIM security (PIN, PUK... ) SIM phone book
5 A brief history of Linux telephony N900 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)...
6 A brief history of Linux telephony N900 The standard (?) Hayes commands set ITU V.250 3GPP better known as AT commands
7 A brief history of Linux telephony N900 The standard (?) Hayes commands set ITU V.250 3GPP better known as AT commands designed in the seventies... originally for 300 bauds fixed serial line ASCII
8 A brief history of Linux telephony N900 The standard (?) Hayes commands set ITU V.250 3GPP better known as AT commands designed in the seventies... originally for 300 bauds fixed serial line ASCII awkward multiplexing PPP (binary) for backward-compatibility
9 A brief history of Linux telephony N900 Besides the standard AT commands extensions: vendor-specific commands many implementations not fully adherent
10 A brief history of Linux telephony N900 Besides the standard AT commands extensions: vendor-specific commands many implementations not fully adherent Full replacement for AT commands, e.g.: : Phonet / ISI ST-Ericsson: CAIF PPP can be replaced too: proprietary framing Ethernet emulation
11 A brief history of Linux telephony N900 Existing solutions Qtopia: technology showcase for Qt
12 A brief history of Linux telephony N900 Existing solutions Qtopia: technology showcase for Qt OpenMoko: low-level D-Bus API Android Radio Interface Layer (RIL)
13 A brief history of Linux telephony N900 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: modem-specific, closed
14 A brief history of Linux telephony N900 Outline 1 A brief history of Linux telephony 2 N900 3
15 A brief history of Linux telephony N900 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
16 A brief history of Linux telephony N900 Phonet simple datagram-based binary protocol multiplexing out of the box asynchronous notifications abstraction layer for modem interconnect one IP packet = one Phonet datagram
17 A brief history of Linux telephony N900 Phonet simple datagram-based binary protocol multiplexing out of the box asynchronous notifications abstraction layer for modem interconnect one IP packet = one Phonet datagram : Phonet stack, GPRS, USB gadget : USB host driver same stack on N900 and PC!
18 A brief history of Linux telephony N900 Outline 1 A brief history of Linux telephony 2 N900 3
19 A brief history of Linux telephony N900 architecture D-Bus core stack Modem driver API Generic AT driver Calypso driver ISI driver TTY Phonet stack Plugin API
20 A brief history of Linux telephony N900 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
21 A brief history of Linux telephony N900 drivers hardware auto-detection modem message formatting/parsing plugin sub-layer for AT modem variants hardware-specific extra functions
22 A brief history of Linux telephony N900 vs CSD comparison D-Bus CSD plugins core CSD ISI driver Phonet stack OMAP SSI USB CDC-Phonet Cellular modem device
23 A brief history of Linux telephony N900 References project Linux kernel
24 A brief history of Linux telephony N900 Any questions?
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