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Skype allows these registered users to communicate through both instant messaging and voice chat. Voice chat allows telephone calls between pairs of users and conference calling and uses proprietary audio codec. Skype's text chat client allows group chats, emoticons, storing chat history, and editing of previous messages. Offline messages were ...
For some features: secret chats, [116] voice and video calls, [117] and voice chats in groups [117] No No No Tencent QQ: No [118] [119] No No No No Threema: No A valid phone number or email address is not required for registration & login. However, the mobile app serves as the primary device, due to the end-to-end encryption architecture. [120 ...
3GPP standards: Friedhelm Hillebrand: 1985 Proprietary: Phone number (e.g. +15550123) Yes No No About 250 contacts in SIM, unlimited from phone. No serial messages Medium No Yes 3G-324M/ViLTE: RCS: No ? ? 3GPP standards; Bitmessage: Jonathan Warren 2012 Nov Open standard: Alphanumeric address Yes Yes Yes Yes No Yes Yes (through proof-of-work ...
Non-English voice recognition Yes: Yes [375]? No: No: Yes Sound recorder Very limited (Does not work in background [376] and not voice controlled) 3+: Limited (Not voice controlled) [377] [378] Partial: 3rd party software [379] 3rd party software: Yes Call recorder Yes, Phone by Google, [380] but also possible with 3rd party firmware [381]
Various proprietary VoIP software FFmpeg voice recording: No Yes No Yes No G.726: ITU-T 1990-12 Free Various proprietary VoIP software FFmpeg, Ekiga and other VoIP software voice recording: No Yes No No No G.728: ITU-T 1992-09 Non-free Various proprietary VoIP software voice recording: No Yes No Yes No G.729: ITU-T 1996-03 G.729 (06/12) Free ...
Current 3GPP standards incorporate the latest revision of the GSM standards. The documents are made available without charge on 3GPP's web site. The Technical Specifications cover not only the radio part ("Air Interface") and Core Network, but also billing information and speech coding down to source code level.
3GPP TS 26.273 – AMR-WB+ speech Codec (C-source code) – reference implementation [29] Enhanced Voice Services (EVS) 3GPP TS.26.443 – Codec for Enhanced Voice Services (EVS) – ANSI C code (floating-point) [30] 3rd Generation Partnership Project 2 (3GPP2) Enhanced Variable Rate Codec (EVRC, a.k.a. IS-127) – based on RCELP
System Architecture Evolution (SAE) is the core network architecture of mobile communications protocol group 3GPP's LTE wireless communication standard.. SAE is the evolution of the GPRS Core Network, but with a simplified architecture; an all-IP Network (AIPN); support for higher throughput and lower latency radio access networks (RANs); and support for, and mobility between, multiple ...