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Ubuntu Desktop Telephony Stack
The document outlines a proposed telephony stack aiming to create a unified user experience for various devices by integrating cellular, VoIP, and other communication protocols into a single platform. It emphasizes a lightweight design that allows for easy application development without the need for complex, multiprotocol clients. The discussion also addresses the historical context of telephony applications and raises questions about the suitability of different architectures for the long-term future of Ubuntu.
Ubuntu Desktop Telephony Stack
- 1. Telephony Stack –Problem Space Desktop Laptop Netbook Touchpad Devices Cellphones Primarily VoIP & IM Primarily Cellular and SMS Applications: * calling * messaging * notify and screening * acd agents & call centers * relationship management * address book integration
- 2. Telephony Stack -Goals * Unified user experience – does not matter if cellular, voip, isdn, other Dialing a phone number should always be same regardless of backend Receiving incoming call as a consistent user experience Using contacts and address books should be automatic and consistent * Unified development model – client apps written once to one application family No need for multiprotocol clients or writing to multiple complex api's Enable applications development rather than telephony client development * Single telephony stack that can serve cell phones to desktop Must be lightweight * Based on existing packages and components where possible No need for NIH * Utilizes Ubuntu desktop elements to improve user experience Integrates with indicators and osd notify “Collapse the problem space so that developers can produce applications for users easily regardless of environment “
- 3. Telephony Stack -History * Traditional designs Protocol specific client; separate client for VoIP, cellular, ISDN, etc Applications designed around and for specific telephony protocols Applications involved in low level media issues * Unified multiprotocol clients Examples include Empathy and Pidgeon Support for many protocols build as plugins Complex configuration for each protocol Requires media support in client Complex to build telephony applications outside of client Client has to be embedded to do basic applications * Telephony unification started in Lucid Proposed SIP as universal client protocol Used sipwitch to route sip requests to various services Client development has to start as VoIP client
- 4. Telephony Stack –Forward from Lucid
- 5. Telephony Stack –ofono proposal bottom-UP Applications Indicators Configuration Handlers oFono deamon oFono Dbus oFono Dbus oFono Dbus oFono Dbus GSM lmodem SIP & RTP Audi o & Mic VoIP provider or optional Sipwitch
- 6. Telephony Stack –wed. UDS Applications Indicators Configuration Handlers Telepathy daemon over Dbus VoIP Service Chat Services oFono Service oFono Service daemon over Dbus GSM Service Linmodem Service SIP Witch over SIP + Telepathy cfg SIP Providers SIP Peers Local IP-PBX
- 7. Telephony Stack -Discussion Do either architectures make sense? Which is most appropriate long-term for Ubuntu? What are the other options to consider? What are the problems & limitations that remain?