Linphone is a free software which is the very first open-source VoIP Softphone App Development, enables free communication over the internet using SIP on Linux, that has become very popular especially within the open-source community, available on leading mobile and desktop platforms such as iOS, Android, Windows Phone 8, Linux, Windows Desktop, MAC OSX and also on web browsers. Many hardware and software applications for end-users rely on Linphone VOIP development. Linphone can communicate freely with people over the internet, either voice or video and even can text instant messages.
What are the top skills required for Linphone developers?
- The software development skills required for Linphone VOIP developers are C++, C, Java, C#, Objective C.
- For video and voice calling the skill needed are media streaming engine and signal processing.
- For communication protocols, the VOIP developer needs SIP, RTP, ICE, TURN, codecs.
- For having secure communication, the Linphone app developers must know an end to end encryption for messaging that has SIP LS, SRTP, SRTP-DTLS, zRTP.
- For Linphone mobile application like Android and iOS development, the required skills are iOS, Android and QT, Xamarin.
Linphone app development follows open standards from the telecommunication industry(SIP, RTP), it is interoperable with most PBXs and SIP servers and also includes your own Flexisip server and can be used with any SIP VoIP operator. Linphone has complete solutions for instant messaging, and IP to IP calls such as Linphone apps, Liblinphone cross-platform VOIP SDK and Flexisip server.
Let’s check in detail about Linphone development
Linphone for Android, iOS and tablets
Linphone is fully SIP-based for all calls, presence and IM features. Use Linphone for free and enjoy it has an intuitive interface and enhanced features with an existing SIP account or with free SIP service. Let’s see what all the things that app development using Linphone has:
Advanced features for calling
- HD video calls with the preview that is supported by H.264, H.265 and VP8 codecs
- Audio call conference
- Using Linphone, you can transfer the call and also handle multi-call management which supports Pause and Resume
- Call recording and replay for audio call only
- Multi-participant instant messaging
- End to end encryption for one to one and group participants
- Smart contact list
- Provisioning through QR Code
- Bluetooth headset support
- Blind Accessibility
- Dedicated tablet user interface
Quality of Audio and video has increased
- The audio and video quality was handled with Jitter buffer algorithm
- Adapts Bitrate control to maintain quality
- With the support of Opus maintains HD voice and echo cancellation
- Has call quality indicator and also shows advanced call statistics.
Simple usage graphical interface
- Assistance for account creation
- Smart Contact list where it synchronises with Android or iOS
- Call history
- Have the option to invite friends
- Remote provisioning from QR code or URL
Has high secured communication
- Communication will be tackled with SIP TLS along with the cypher algorithms.
- There will be encryption for audio and video calls with the help of SRTP and ZRTP
- Even there will be end-to-end encryption for one-to-one and group messaging.
Linphone for desktop platforms
Generally, Linphone is available for GNU/Linux, macOS and Windows Desktop. Now there is a new version is Linphone desktop four that is fitted for both standard users with no particular knowledge of VoIP/SIP and also for advanced audio/video calling uses fully SIP-based for all calls, presence and IM features. Even this Linphone Desktop is free and has a modern look and feel. Its features can be accessed with free SIP service or with an existing SIP account. Let’s see what all the things that Linphone desktop apps support:
Enhanced calling features
- Can have HD calls in full-screen mode with the support of H.264, H.265 and VP8 codecs
- The audio and video quality is optimised by adapting the jitter buffer and bitrate algorithms
- Same like linphone mobile apps Opus supports for HD voice and for echo cancellation.
- Conference audio call can support up to 8 participants
- Can handle multiple call management with pause and resume actions.
- With the support of DTMF call transfer and auto-answer will be done.
- There are call quality indicators and display of advanced call statistics
- With the help of SIP/TLS, SRTP and ZRTP communication will be secured.
Intuitive user interface
- With swift access to major features, the user experience is simplified
- Communication is made easy with the search bar
- Contact list with presence status
- Recent events can be accessed quickly and easily
- Can have multi-accounts and multi-device support
Improved experience for instant messaging
- File sharing is possible with instant messaging
- During the call, the user can access to view chat
- IMDN(Intuitive Message Delivery Status)
Linphone web integration
Linphone desktop is available for Chrome, Edge, Firefox and Safari, which can be able to interact with web browsers and integrated to web services. The latest version o Linphone Desktop 4.2 is capable of receiving information from web browser to commence a call, open the app, invite members to have a conference call etc.
Also go through our blog: https://krify.co/multi-party-video-audio-collaboration-with-enhanced-asterisk-services-linphone/
Liblinphone SDK
Liblinphone is a high-level open-source library that integrates all the SIP voice/video and instant messaging feature into a single easy use of API. Basically, this is a VOIP SDK engine on which Linphone applications are based. User-agent library for SIP signalling(belle-sip) combines with media processing and Mediastremer2 streaming toolkit in Liblinphone
What are the features of signalling, media and instant messaging in Liblinphone?
Media features in VOIP SDK engine
- With the support of Opus codec provides HD audio calls
- With the support of H.264, H.265 and VP8 codecs provide HD video calls
- To provide the best media streaming adapts jitter buffer algorithm and bitrate control.
- ICE support for optimised NAT traversal
- SRTP and ZRTP will do media encryption
- Provides audio and video call recording
Instant messaging features
- It includes one-to-one and groups instant messaging option
- Displays delivery and is typing notifications while using instant messaging
- Provides end-to-end encryption for one-to-one and also for group conversations
- With configurable settings, File sharing will be done automatically/manually download attachments.
Signalling features
- There is authentication with digest and TLS client certificate
- Handle multiple call management with options like hold, resume, transfer and more.
- Supports multiple SIP proxy support: Registrar, outbound proxies, proxies.
- Using list subscription to the presence server with Presence
- DTMF is used to support Telephone tones
- With IMS networks support interoperability
- Best fit for building a VoLTE compatible client
Even go through our blog: Linphone – Sip Voip- Customization
Flexisip Server
Flexisip server is a complete, modular and scalable SIP server suite that includes proxy, presence and group chat functions. This server provides an easy-to-install SIP server solution with all the features necessary to deploy your own SIP service for mobile or desktop applications. Using this Flexisip server, linphone users can create their own SIP addresses to connect with each other. Let’s see all the features of SIP server suite:
Proxy
- Interconnected with push notification systems
- High accessibility and cluster mode for large deployments
- High-level performance logging for activity monitoring
- Digest and client certificate authentication
Group Chat
The linphone has come with entirely SIP-based open-source solution for group chat. The new version of Linphone 4.0 for Android and iOS utilizes Linphone’s new Java/JNI wrapper, automatically derived from the liblinphone C API. The following group chat features:
- Effectively manages Group and individual chats
- This is supportive in multi-devices
- Get notifications of group events like users joining or leaving, new admins, etc.
- Multiple groups with admins
- Supports for multi-device per participant
- There will be file sharing for all types of content
- There will be a search bar for selecting the participants
- There will be intuitive message delivery status
- Group events with notifications
In order to bring group chat features, Flexisip server conference server has joined the Flexisip server suite which handles group participants and group event notifications. For those who have their own SIP infrastructure, it is possible to deploy Flexisip conference server into an existing SIP network running with the third party SIP server.
Group IM with SIP-based
Users utilize SIP as a signaling protocol to create, modify, and terminate multimedia sessions with one or more users. But now there is a possibility to develop IM and group IM solutions.
Beta version of Linphone Group Chat is available now
Group chat is most widely available in most popular instant messaging apps and also in VOIP Android and iOS apps. As Linphone is a Free SIP communication application finally came with the beta version of the group chat for multi-participant text communications. The Linphone developers can now get ready to install the beta release for our VoIP Softphone iOS and Android applications and test the group chat features. Some of the features of Group chat are:
- Create text sessions with Multiple participants
- Send and receive messages from multi-devices
- You can name other admins in the group from the group info
- Add or remove the users which done only by admin
- Can view message delivery status
- Can share images among group members
- Can view notifications of group events like new user joining, leaving and new admins, etc.
Check our blog: https://krify.co/try-new-group-chat-on-linphone-2019-voip-community-updates/
Presence
Generally, Flexisip server handles everything from a client application such as SIP subscribe and publish whereas to identify users of the Flexisip service within the address book. This also provides users with a real-time status presence. You can integrate this Flexiisp service with SIP infrastructure for various purposes, including running its own VOIP service in the cloud, installing it in small hardware systems, and operating it in push gateway mode.
Tunnelling – VOIP anti-blocking solution
For VOIP operators there is a VoIP anti-blocking solution which will bypass firewall limitations on 3G network. It tunnels SIP and RTP traffic through a particular single secure https connection to a detunneliser server. In general, the tunnelling server runs on a standard Linux operating system and scales overall available processors. The detunnelise around two hundred simultaneous call sessions per core of a modern x86 server. The tunnelling solution includes:
- Tunnelling for VoIP Android and iOS apps enabled with the integration of Liblinphone SDK
- To deploy a tunnelling server inside the network infrastructure, then it re-creates a SIP and RTP traffic from the data of every secure connection to the softphone clients.
Linphone instant messaging encryption
For instant messaging, there is an end to end encryption provided with Linphone instant messaging encryption(LIME) library, which allows the users to exchange messages privately and asynchronously. This feature will support multiple devices with multiple users. This provider two security benefits to users for instant messaging – End -to -end encryption in which only the user and his contact can decrypt the content that you shared. Forward secrecy ensures that a third party cannot decrypt encrypted messages unless they include the public key.
Mediastreamer2
Mediastreamer is an open-source and robust streaming engine for voice/video VoIP softphone applications. This is liable for receiving and sending all multimedia streams in Linphone that includes voice/video capture, encoding and decoding and rendering.
Krify is a leading VoIP Softphone app development company in India and the UK. We provide Linphone app customization with your branding. Our Linphone app developers are well experienced and highly skilled. Please contact us for your VOIP Softphone app development.
