Softphone research

Start with the calling environment

A softphone is calling software on a computer or mobile device. A browser webphone uses WebRTC and a server connection designed for that environment. Both still need a suitable PBX or voice service, user identity, authorization, audio devices and a tested inbound route.

Explore desktop clients, mobile clients and browser clients according to where the user actually works. A browser development library should not be mistaken for a hosted phone service.

Research the exact account and edition

Linphone, Bria, MicroSIP, PhonerLite, Zoiper, Acrobits Softphone, Groundwire, Blink, Telephone, Sipnetic, SessionTalk and MizuDroid have different configuration and delivery arrangements. PortSIP ONE is a further distinct case: its current client is documented for PortSIP PBX 22.x rather than as a generic third-party SIP client. Grandstream Wave is likewise a UCM ecosystem client across separate desktop, mobile and web tracks. 3CX apps are another phone-system-bound family whose Windows, mobile, Web Client and PWA paths must not be converted into a generic third-party SIP-account workflow. A feature documented for a vendor account or enterprise edition may not be available to a generic third-party SIP account. Record the app build, licensing edition, operating system, phone system and number that was tested.

Bria's current first-party release notes identify different version tracks: desktop 6.8.8.1 dated September 28, 2026, and iOS and Android 6.23.5 dated August 20, 2026. The desktop patch is scoped to erroneous suspicious-software detection and is not represented as a feature release or instruction to disable security controls. All three pages still warn that stun.counterpath.com will be decommissioned in September 2026, but they do not confirm an exact shutdown time or observed status after that month. The Bria record requires configuration and call-path evidence before replacing a demonstrated dependency.

The comparison above is sourced research rather than a performance ranking. For each deployment test outbound and inbound calls, transfers, microphone selection, reconnection, Wi-Fi to mobile-data changes, and emergency location.

Blink has independent release evidence: Windows 6.0.3, Linux 6.0.6, Blink Pro for Mac 7.1.6 in the App Store and a separate Mac beta 9.4.0 at review. The vendor changelog landing page lagged the App Store's stable Mac version, so preserve the exact product, channel and source instead of selecting the largest family number. Telephone is a macOS-only client whose distributed App Store 1.6 release from June 2022 remains separate from the current repository instructions for source-building Opus, LibreSSL and PJSIP with a macOS 15.6 minimum target. Repository activity and a newer build target are not a newer distributed version or support commitment. Sipnetic is an Android-only research record; its developer lists TLS, SRTP and ZRTP controls but does not document a push relay or guarantee locked-screen delivery. SessionTalk is a generic iOS and Android SIP client whose optional push path inserts a vendor registration and signaling proxy; keep it distinct from SessionCloud, white-label and desktop products. MizuDroid is Android-only and can use server-native push, a Mizutech SIP-push gateway or a background service; preserve the selected path and edition rather than treating them as interchangeable.

Baresip is a modular core with platform-specific packaging and interfaces. Compare the exact artifact and loaded modules rather than treating every wrapper or repository feature as one finished, centrally managed client.

Sangoma Phone is a licensed, PBX-bound family for supported Sangoma systems rather than a generic SIP-account client. Its installed desktop and browser paths share PBX identity but retain different packaging, permission and runtime boundaries; FreePBX/PBXact readiness also depends on PJSIP extensions, Sangoma modules, service access and feature-specific licensing.

Jitsi Desktop is a distinct legacy SIP and XMPP client, not Jitsi Meet. Its project says active development has ended and packages now depend on community contributions, so preserve the exact channel, runtime and maintenance evidence and plan migration rather than treating a download as current platform support.

Keep control of provisioning and secrets

Determine where credentials are stored, who issues a configuration link, how access is revoked and whether a push service handles account registration in the background. Use trusted configuration delivery and the PBX’s minimum necessary calling permissions.

An encrypted signaling setting does not establish encrypted media. Verify transport and negotiated media independently, with a failure test when encryption is required. A TURN relay changes the media path but does not prove encryption.

Groundwire and Acrobits Softphone document the push boundary directly: in push mode SIPIS registers the account, while Standard registration keeps it on the device. A private PBX reachable only through a VPN may require Standard mode. Their iOS CallKit behavior and device-variable Android integration are separate from registration and push delivery; test audio focus, interruptions and locked-screen arrival on the exact handset.

Acrobits Softphone and Groundwire share a vendor and push architecture but not the same product scope. Use the Acrobits Softphone guide for the basic retail client rather than transferring Groundwire or Cloud Softphone capabilities.

PhonerLite adds a local .plp profile path for Windows. Because that file can carry a password or a stored credential value, treat it as secret delivery rather than a harmless preference file.

Make a bounded pilot repeatable

Give every test a timestamp, client version, server identity and expected result. Check first launch, signed-out state, sleep, reboot and connectivity changes. Keep a desk or mobile fallback for critical calls. Use provider-approved emergency testing rather than placing a live emergency call as a casual check.

Treat Acrobits iOS Web Access as a temporary data-export surface

The refreshed Acrobits Softphone and Groundwire guides now bound the optional iOS Web Access listener. The first-party procedure exposes call history and recorded-call downloads to a browser on the same Wi-Fi network while the application is open, and documents admin and 1234 as the defaults. Replace that default before an authorized export, limit the activation window and verify the listener is disabled afterward.

Treat JsSIP as an application component

JsSIP is a JavaScript SIP library, not a turnkey phone or hosted account. Its WSS connection, SIP identity, registration, browser permission, WebRTC negotiation, remote-media rendering, page lifecycle and package provenance need separate ownership and evidence.

Keep Baresip 4.12.0 and libre 4.12.0 in one runtime record

Baresip 4.12.0 and libre 4.12.0 were released September 30, 2026. The libre release carries a security notice, while the Baresip release adds outbound custom X- headers and audio-path fixes. Record the selected core, loaded library, package provenance, modules and operating-system target together; application version alone does not prove the library fix or authorize a custom signaling field.

Keep Linphone desktop stable archives separate from mobile stores

The Linphone guide was rechecked against the first-party stable archives on October 7, 2026. Windows, macOS and GNU/Linux each remained at desktop 6.2.3 dated September 22. Record the exact executable, disk image or AppImage and retrieval date; do not copy that desktop version into iOS, Android, daily-snapshot, SDK or server records.

Keep Jitsi Desktop in the comparison as a community-maintained legacy client

The Jitsi Desktop record now appears in the structured softphone comparison. Its release archive still marks 2.8.5426 as Latest and the higher-numbered 2.11.5633 as Pre-release; its community maintenance and package channels remain deployment constraints rather than current-platform support promises.

Update MicroSIP only after the primary channel changes

The MicroSIP record now reflects 3.22.18 on the publisher’s primary download table as checked October 7, 2026. Regular and Lite editions, installer and portable formats, cached catalogue state and the installed executable remain separate evidence; the release notes do not establish PBX, headset, driver or protected-call compatibility.

Keep Grandstream Wave 1.35 platform and server gates visible

The refreshed Grandstream Wave record separates Desktop 1.35.6, Web 1.0.35.7, Android 1.0.35.7 and iOS 1.35.7, all dated September 21, 2026. UCM firmware, identity-provider configuration, permissions and integration state remain separate from client installation; beta AI, remote control and WhatsApp calling are not represented as generic SIP-client features.

Preserve the SIP.js release and security-policy conflict

The refreshed SIP.js record keeps the repository's 0.21.2 Latest label separate from its security-policy table, which names 0.19.x as supported but does not state the status of 0.20.x or 0.21.x. It also distinguishes SimpleUser, SessionManager and the full API, and treats Android browser compatibility as a foreground statement rather than proof of push or background reachability.

Separate Zoiper's hosted and on-device transcript paths

The refreshed Zoiper record keeps the built-in hosted Banafo integration separate from the Zoiper Scribe desktop application. Scribe works from completed recording files and says transcription runs locally; it does not register a SIP account, join a call or create the recording. Zoiper 5 edition, recording entitlement, Scribe edition, local storage, optional hosted processing, exports, consent and retention therefore remain separate acceptance facts.

Keep Cloud Softphone separate from the retail Acrobits apps

Acrobits Cloud Softphone is a managed generic and white-label platform whose portal, Cloud ID, external Account XML, release state and SIPIS path need their own evidence. Use the stale-provisioning diagnostic when one delivered value is wrong; do not transfer those controls to retail Acrobits Softphone or Groundwire.

Separate MizuDroid's public and customer release tracks

MizuDroid now has an explicit channel boundary: Mizutech labels 4.6 a June 2026 APK or custom-build release and says it will not refresh the public Play demo with that branch. Preserve the exact installed package and build, then identify provider push, the Mizutech gateway or background service before comparing locked-screen behavior.

Keep Linphone XML delivery separate from runtime acceptance

The Linphone provisioning diagnostic follows one wrong value from provisioning link or QR-carried URL through the next application start, XML response, overwrite policy and transient behavior. Registration and a completed call remain later acceptance stages.

Browser call alerting is a chain, not a ringtone

The browser no-ring diagnostic separates WSS and registration, INVITE delivery, visible incoming-call state, browser playback policy, user activation, answer and remote conversation audio.

Trace MicroSIP from active account to rendered audio

The refreshed MicroSIP guide separates its one active SIP account from saved accounts and Local Account, then keeps dial-plan transformation, Call Manager, public-address helpers, negotiated media and Windows devices distinct. Use the MicroSIP call diagnostic when registration succeeds but a call or audio does not.

Trace Acrobits device lifecycle before deleting contacts

The wrong-or-removed-device diagnostic separates Groundwire and Acrobits Softphone account identity, Standard versus Push registration, SIPIS token cleanup and the PBX contact set.

Keep Sangoma Phone login evidence in its PBX service chain

The Sangoma Phone login diagnostic follows one desktop or browser attempt through PBX readiness, user authorization, RTAPI and protected-session boundaries before registration or calls.

Trace Baresip as a modular runtime rather than one fixed app

Use the Baresip registration and audio diagnostic to separate package, core and libre versions, module availability, loaded account state, registrar exchange and workstation audio.

Do not turn a softphone encryption setting into a call claim

The Linphone media-encryption guide demonstrates the broader evidence rule: capability, selected policy, mandatory behavior, offer and answer, effective call protection and peer authentication are separate. Its diagnostic preserves a failed required-policy call instead of hiding it through downgrade.

Treat softphone NAT traversal as a media-path decision

The Linphone NAT traversal guide demonstrates a reusable boundary: a configured STUN or TURN server is not the same as gathered candidates, a selected ICE pair or working audio. Its diagnostic preserves each stage instead of replacing servers at random.

Use Linphone to trace every mobile push owner

The Linphone push guide applies a reusable rule: a softphone can support push while an account, registrar, proxy, platform delivery or app lifecycle state still does not. Its diagnostic preserves those owners instead of treating background ringing as one switch.

Include reject semantics in softphone acceptance tests

A visible Decline or Busy control can create different SIP responses and different results for parallel devices or voicemail. The Blink inbound-disposition diagnostic demonstrates how to test the UI action, branch behavior and final route separately.

Keep SessionTalk push mode and PBX contact behavior aligned

SessionTalk documents materially different registration ownership across Multiple Registrations, Synchronous, Single Register and SessionCloud Continuous settings. The focused diagnostic tests the effective mode against PBX contacts instead of treating push as one device toggle.

Keep the VoIPstudio client inside its service boundary

The VoIPstudio Desktop guide covers a service-specific Windows, macOS and Linux client whose web-account login, endpoint row, audio selections and network tests remain separate. Use the paired diagnostic without treating an online icon as call or media proof.

Treat Webex App as four possible calling services

The Webex App calling guide keeps Call on Webex, Unified CM, Webex Calling and hosted service-provider calling distinct before comparing features or call evidence.

Date the MicroSIP package claim

MicroSIP’s current pointer and primary download table listed 3.22.19 on October 17, 2026. Keep regular versus Lite, installer versus portable, displayed catalogue version and installed executable separate; release notes do not establish PBX, driver or protected-call compatibility.

Keep PhonerLite package and local-data ownership separate

PhonerLite 3.46 can load configuration beside a writable executable or from %APPDATA%. The diagnostic identifies the active files before restoring credentials or history.

Treat Linphone file paths as version-scoped evidence

Linphone’s documented desktop storage tree is based on 4.2 while the stable Windows archive lists 6.2.3. The local-data guide shows how to verify the running build before restoring state.

Keep Blink registration errors tied to one platform build

The Blink registration diagnostic records the product track, DNS or proxy path, response and retry timing before changing the account.