Siperb Mobile Softphone

Siperb Mobile Softphone brings an existing office extension to iOS and Android. It is a strong fit for people and administrators who want a mobile client connected to a PBX they already use. Its broad call handling is balanced by a firm requirement to register mobile devices 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 incoming calls when it is backgrounded, locked or restarted. That makes mobile availability more practical than relying on an app staying open, but organizations that require direct mobile registration will need another approach: Proxy Registration Mode is the only mobile option, and it is required for push notifications.

Siperb supports outbound registration, outbound trunk and inbound registration connections to PBXs or ITSPs. Web and desktop clients can also connect directly to a WebRTC-capable PBX through WebSocket Registration Mode, keeping Siperb out of that call path. This gives administrators deployment flexibility across device types, though it does not change the mobile proxy requirement.

Key features

The mobile client handles audio and video calls, attended and blind transfer, three-way conference, DTMF, call history, CDR and buddy presence. That covers routine extension use as well as common call-handling tasks, making it more capable than a client limited to basic calling. The mobile feature set specifies end-to-end encryption using TLS and DTLS-SRTP, a meaningful safeguard for organizations concerned with call security.

One Siperb account works across web, Windows, macOS, Linux, iOS and Android, sharing call history, contacts and settings. That continuity suits users switching between desk and mobile devices. The documented REST API and permanent tokens for external backend systems also give developers a route to connect Siperb with other services; developer embedding and reseller co-branding resources serve more specialized use cases.

Support is divided by need: community support handles general questions, while technical issues require paid support. 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.

Pricing

The freemium structure starts with Personal at £0.00 per free. It has limited storage, keeps SIP Trace Logs and Register Activity Logs for seven days, and includes community support but no technical support. It is a sensible way to begin for an individual or small deployment that can manage without technical assistance or longer log retention.

Business costs £2.00 per month, billed per month per domain user. It extends both log-retention periods to six months and adds technical support, making it the practical step up for teams that need help resolving technical issues or need more history for administration. Business Pro costs £5.00 per month, also billed per month per domain user; it extends both log periods to 12+ months while retaining technical support. The higher tier is for organizations with a stronger need to preserve operational records. Per-user billing means the price scales with domain users rather than being a flat team fee.

Free support generally responds in about 48 hours; paid technical support generally responds in about 24 hours. Those response windows make the free plan less suitable where timely technical assistance matters.

Platforms

Siperb supports Android, iOS, Linux, macOS, web and Windows, with mobile, desktop and browser calling. Its shared account data makes it relevant to mixed-device environments rather than a mobile-only workflow.

Who it's for

Choose Siperb if you already have a compatible SIP PBX and want mobile extension calling, push-delivered incoming calls and shared account data across devices. It also suits IT administrators who value call-handling features, connection options and a REST API. It is a weaker fit for organizations that insist on self-hosting or direct mobile registration, and for users who need technical support without a paid plan.

Pros and cons

Broad PBX compatibility: works with major named systems and SIP PBXs that can provision an extension.

Useful mobile call handling: video, transfers, conferencing, presence and encrypted calling extend it beyond basic voice use.

Cross-platform continuity: contacts, settings and call history carry across six platform families.

Mobile registration is constrained: mobile devices must use Proxy Registration Mode, which is also required for push notifications.

Self-hosting is not an option for cloud components: customers needing their own server installation should look elsewhere.

Free support is limited: Personal excludes technical support and has shorter log retention than paid plans.

Alternatives

Softphone Software is the broader category to browse if Siperb’s proxy-based mobile registration or cloud hosting is not a fit.

Blink is worth considering for a free softphone across Linux, Mac and Windows; its use requires a SIP account. SipPulse Softphone offers a free app plan with unlimited users and installations, which may suit deployments prioritizing those limits. Bria Solo is an option for personal, non-commercial use on one device with one SIP/VoIP account and limited weekly calls. Linphone is the alternative to consider when open-source software or integration under the GNU GPLv3 matters.

Zoiper has a free non-commercial plan limited to one account and two lines, while Sip:phone is an option for users with an existing Sipwise server account. Aria offers a free plan for personal, non-commercial use with unlimited calls and multi-account support. Phoner is another alternative to compare.

Verdict

Siperb Mobile Softphone is a well-rounded choice for PBX users who want mobile calling with push delivery, capable call handling and account continuity across devices. Its free plan lowers the barrier to trying that setup, while paid tiers add longer logs and technical support. Choose another product if mobile registration must bypass Siperb’s proxy or if your organization requires self-hosting.