community/sig/sig-telephony/sig_telephony.md

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# SIG-Telephony
English | [简体中文](./sig_telephony_cn.md)
Note: The content of this SIG follows the convention described in OpenHarmony's PMC Management Charter [README](/zh/pmc.md).
## SIG group work objectives and scope
### work goals
- Provide basic communication capabilities of cellular mobile networks such as SIM card, network search, cellular data, cellular call and short MMS, manage multi-type call and data network connection, and provide convenient and consistent communication API for application developers.
### work scope
- Telephony core service: initializes the RIL Manager, SIM card module, and network search module.
- Call Manager module: manages three types of calls circuit switched (CS), IP multimedia subsystem (IMS), and over the top (OTT) calls. It is responsible for applying for the audio and video resources required for a call and resolving conflicts in a multi-channel call.
- Cellular call module: implements basic calls over carrier networks.
- SMS & MMS module: provides the capabilities of sending and receiving short message service (SMS) messages and encoding and decoding multimedia messaging service (MMS) messages.
- State registry module: provides APIs to register and deregister an observer that listens for various callback events of the telephony subsystem.
### The repository
- project name:
- core_servicehttps://gitee.com/openharmony/telephony_core_service
- cellular_callhttps://gitee.com/openharmony/telephony_cellular_call
- call_managehttps://gitee.com/openharmony/telephony_call_manager
- state_registryhttps://gitee.com/openharmony/telephony_state_registry
- sms_mmshttps://gitee.com/openharmony/telephony_sms_mms
- ril_adapterhttps://gitee.com/openharmony/telephony_ril_adapter
- cellular_datahttps://gitee.com/openharmony/telephony_cellular_data
- data_storagehttps://gitee.com/openharmony/telephony_data_storage
- netmanager_standardhttps://gitee.com/openharmony/communication_netmanager_standard
## SIG Members
### Leader
- @zhang-hai-feng (https://gitee.com/zhang-hai-feng)
### Committers
- @zhang-hai-feng (https://gitee.com/zhang-hai-feng)
- @jyh926 (https://gitee.com/jyh926)
- @clevercong (https://gitee.com/clevercong)
- @ohos-lsw (https://gitee.com/ohos-lsw)
- @xautosoft (https://gitee.com/xautosoft)
- @hwlitao (https://gitee.com/hwlitao)
### Meetings
- Meeting timeBiweekly regular meeting 16:00-17:00 on Thursday afternoon
- Meeting application: [SIG-Telephony Meeting Proposal](https://shimo.im/sheets/wgwGRwc9KCYH6Txv/MODOC)
- Meeting link: Welink Meeting or Others
- Meeting notification: [Subscribe to] (https://lists.openatom.io/postorius/lists/dev.openharmony.io) mailing list dev@openharmony.io for the meeting link
- Meeting-Minutes: [Archive link address](https://gitee.com/openharmony-sig/sig-content)
### Contact (optional)
- Mailing listdev@openharmony.io
- Slack grouphttps://zulip.openharmony.cn/
- Wechat groupNA