Siperb Mobile Softphone

Siperb Mobile Softphone is a way to use an existing office phone extension from an iOS or Android device. It is a strong fit for teams already running a compatible SIP PBX that want mobile calling alongside desktop and web clients. The central trade-off is clear: mobile registration must go through Siperb’s proxy.

Overview

The mobile app connects to Asterisk, FreePBX, FreeSWITCH and other SIP PBXs that can provision an extension. Siperb’s proxy uses Apple APNs or Google FCM to wake the app and deliver calls when it is backgrounded, locked or restarted. That makes it more practical for receiving calls away from a desk than an app that must remain open, but organizations that require direct mobile registration should look elsewhere.

Beyond mobile, Siperb supports outbound registration, outbound trunk and inbound registration connections to PBXs or ITSPs. Web and desktop clients can connect directly to a WebRTC-capable PBX using WebSocket Registration Mode, keeping Siperb out of that call path. The split gives mixed-device deployments options, while leaving mobile subject to the proxy requirement.

Key features

Mobile calling covers audio and video, attended and blind transfer, three-way conference, DTMF, call history, CDR and buddy presence. That is a useful range for users who need more than basic extension dialing, including common call-handling tasks. End-to-end encryption using TLS and DTLS-SRTP is part of the mobile feature set, a meaningful consideration for organizations handling calls that warrant protected signaling and media.

The same Siperb account works across web, Windows, macOS, Linux, iOS and Android, with call history, contacts and settings shared between clients. That continuity is a practical advantage for people who move between a desk and a phone. Siperb also provides a documented REST API and permanent tokens for external backend systems, which may suit administrators connecting account functions to their own systems; it is not necessary for ordinary calling.

Pricing

Siperb has a free Personal plan and paid Business and Business Pro plans. Personal costs nothing and has limited storage, seven-day SIP Trace Logs and Register Activity Logs, community support, and no technical support. It is the sensible starting point for an individual or small deployment willing to handle technical issues without paid assistance, but short log retention and the lack of technical support make it a weaker choice when troubleshooting or operational continuity matters.

Business costs £2 a month, billed per month per domain user. It extends both log types to six months and includes technical support, with an approximately 24-hour response for paid support. This is the more practical tier for teams that need support and a longer troubleshooting history. Business Pro costs £5 a month, also billed per month per domain user, and extends the logs to 12+ months while retaining technical support. It fits organizations that need longer records; the higher per-user cost is difficult to justify if six months of logs is enough.

Free support is for general questions and has an approximately 48-hour response, while paid support covers technical issues with an approximately 24-hour response. The pricing is user-based within a domain, so the paid tier cost scales with the number of domain users. No call quota or trial term is specified for these plans.

Platforms

Siperb provides mobile clients for Android and iOS, desktop clients for Windows, macOS and Linux, and a web client. Shared account history, contacts and settings make that breadth more useful than simply offering separate clients: users can switch devices without abandoning the same account context. Browser calling, desktop apps, mobile apps, SIP support and call recording are supported.

Siperb’s cloud-hosted components cannot be installed on a customer’s own servers. Organizations that require self-hosting should consider its open-source Browser Phone instead, though that is a separate product rather than a self-hosted Siperb deployment.

Who it's for

Siperb suits end users and IT administrators who already have a SIP PBX and want office extensions to reach mobile devices, with desktop and web access for the same account. Its PBX compatibility and shared cross-platform account support make it particularly relevant to organizations with mixed device fleets. It is less suitable for teams that insist on self-hosting Siperb’s cloud components or direct mobile registration. Siperb also offers separate developer embedding and reseller co-branding resources, pointing to options for businesses integrating or reselling softphone capabilities.

Pros and cons

• Broad SIP PBX compatibility: Works with Asterisk, FreePBX, FreeSWITCH and any SIP PBX that can provision an extension, so an existing system need not be replaced.
• Useful mobile call handling: Video, transfers, conferencing, DTMF and presence go beyond basic calling for users who handle calls as part of their work.
• Shared accounts across six platforms: Call history, contacts and settings carry across mobile, desktop and web clients.
• Mobile registration is constrained: Proxy Registration Mode is the only option, so deployments requiring direct mobile registration are a poor fit.
• Free support has real limits: Personal includes community support, no technical support and only seven days of logs, which may frustrate teams that need help resolving issues.
• No customer-hosted cloud components: Organizations with a self-hosting requirement need another product.

Alternatives

Softphone Software is the broader category directory for comparing options. For another free, cross-platform client that requires an existing SIP account, consider Blink; its free downloads cover Linux, Mac and Windows.

SipPulse Softphone is worth comparing for its free App SipPulse plan, which covers iOS, Android, Windows and Linux with unlimited users and installations. For an open-source option that can be integrated into projects under GNU GPLv3, consider Linphone; proprietary licensing is available for closed-source use.

Aria may suit personal, non-commercial use: its free plan includes unlimited calls, multi-account support and core softphone features. For non-commercial desktop use limited to one account and two lines, consider Zoiper. Bria Solo is another option for personal non-commercial use, with a free plan limited to one device, one SIP/VoIP account and calls per week.

MicroSIP is a free GPL v2 Windows desktop SIP softphone for readers who need a desktop-only option. PortSIP Softphone is another free alternative, with a legacy app for PortSIP PBX v16.x.

Verdict

Choose Siperb Mobile Softphone if you already operate a compatible SIP PBX and want mobile extensions with shared account continuity across phones, computers and web. Its broad PBX support and substantial mobile call-handling set are the strongest reasons to choose it. Look elsewhere if direct mobile registration or self-hosting is essential, or if the free plan’s short log retention and lack of technical support are not enough for your deployment.