A SIP dialer is a software client that uses SIP (Session Initiation Protocol) to make and receive VoIP calls. It can be a mobile app, desktop softphone, or even a web-based client. For IPTSPs, call centers and OTT providers, the dialer is what end-users touch every day—so small details matter a lot.
What Makes a Good SIP Dialer?
Before naming apps, it’s important to understand what actually matters:
- Codec Support – G.711, G.729, Opus for audio; H.264 and VP8/VP9 for video
- Network Handling – jitter buffer, packet loss concealment, echo cancellation
- Security – SIP over TLS, SRTP for media encryption
- Battery & CPU Usage – especially important on Android phones
- Push Notifications & Background Modes – for stable incoming calls
- Branding & Customization – logo, colors, feature toggles, custom flows
1. OnFone SIP Dialer (Custom Solution)
OnFone is our custom SIP dialer solution built on top of the Linphone SDK and tuned for telecom and OTT operators. It is ideal if you need your own branded dialer rather than a generic app.
- HD voice with G.711, Opus and other codecs
- H.264 video calls for compatible endpoints
- Call logs, redial, mute, speaker and hold
- Single or multi-account SIP registration
- Can be integrated with your softswitch or billing
The advantage of a custom dialer such as OnFone is that you have full control over registration logic, feature set, branding and business model.
2. Linphone
Linphone is one of the oldest and most respected open-source SIP clients. It is available on Android, iOS, Windows, macOS and Linux.
- Free and open source
- Supports voice, video and messaging
- Rich codec support including Opus and H.264
- Good NAT traversal with ICE/STUN/TURN support
- SDK available for building custom branded apps
3. Zoiper
Zoiper is a popular commercial SIP softphone. It is known for its stability and cross-platform availability.
- Supports voice, optional video in some editions
- Focus on encryption and secure calling (TLS, SRTP)
- Works well in difficult network conditions
- Commercial licensing for enterprises and OEMs
4. Grandstream Wave
Grandstream Wave is a free softphone designed to work nicely with Grandstream IP-PBX and UCM series, but it can be used with any SIP server.
- Multi-account support (handy for agents)
- Decent call quality and simple UI
- Best fit when you already use Grandstream ecosystem
5. Bria (CounterPath)
Bria is a premium softphone targeted at teams and enterprises that need a polished collaboration client.
- Team features, presence and messaging
- Softphone plus collaboration tools
- Centralized provisioning for large deployments
How to Choose the Right SIP Dialer
When selecting a SIP dialer for your service or company, ask:
- Do you need a fully branded dialer under your own company name?
- Is video calling a must-have, or is audio enough?
- What is your primary platform: Android, iOS, desktop, or all three?
- Do you require integrations with CRM, call center or custom APIs?
- How important are **encryption and compliance** for your use case?
Where OnnetBD IT Fits In
We specialize in building and customizing SIP dialers like OnFone for IPTSPs, call centers, and OTT providers. OnnetBD IT can:
- Develop a fully branded Android dialer using Linphone SDK
- Integrate H.264 video and HD voice with your softswitch
- Implement registration and balance logic with your billing
- Add custom features such as auto-dial, call recording or call logs API
👉 Need a custom SIP dialer or want to modernize your VoIP app? Contact our team at OnnetBD IT to discuss your requirements.