SERVICE

Mobile & Client Applications

Companion apps and communication clients that share the same APIs, identity and call path as the browser — auth, push and WebRTC/SIP included.

React NativeiOS / AndroidPushMobile APIsWebRTC / SIPAuth

Most communication sites stop at browser calling. UnifiedPBX.in also builds the mobile and companion clients that sit on the same backend: authentication, notifications, REST/realtime APIs and WebRTC or SIP when the user is not at a desk.

2026 buying brief

Who this is for

SaaS and CCaaS products that promised a mobile agent or field app and only shipped a desktop WebRTC tab.

What you get

A client that shares tenant, RBAC and call IDs with the web app — plus push that can wake a call.

Searches this page answers

React Native WebRTC, mobile SIP client, PBX companion app, VoIP push notifications.

Reference architecture

One call path, two clients
Web appSIP.js / WebRTC
Mobile appRN · iOS · Android
Auth + push + APIsSame tenant · same RBAC
ICE / TURNNAT that phones actually hit
PBX / CCaaSSIP registration or originate API
If the mobile token cannot start the same call the browser starts, you have two products.

What we own

Companion clients

Agent, supervisor or field apps that talk to the existing control plane.

Auth & sessions

The same identity as the web admin — not a second password file.

Push & wake-up

Notify, then connect media. Silent failure when the OS kills the socket is a defect.

WebRTC / SIP

Native or RN media that lands on your FreeSWITCH or Asterisk like any other endpoint.

Offline-ish UX

Reconnect after radio flip; do not pretend the laptop NAT story applies.

API contract

Mobile is a consumer of the same REST and events the web app uses.

This stays under Application, not a new telecom category. The voice plane is still the PBX. The phone is a client.

FAQ

Questions buyers and AI search engines ask

Same call path, different surface. The browser uses SIP.js; the phone uses a native or React Native client, push wake-up and the same PBX registration or API token. Do not build two unrelated phone products.

Yes when that is the product. Many clients start with a companion app for agents or field staff, not a consumer store brand. We will say when a PWA is enough.

VoIP push and connection service are part of the architecture. A WebView of the desktop softphone will fail the first time the phone sleeps.

React Native is the default when we own the client. Existing Flutter or Ionic apps can be taken over after a repo review. We do not list every framework on the homepage.

Need this built?

Send the current architecture, call volume, carriers and the workflow you need to automate or productize. Discovery can start from a broken PBX or a blank product brief.

Discuss Your Project hello@unifiedpbx.in
Related
WebRTC / SIP.js →APIs & control plane →In-app calling solution →Insurance WebRTC case →

Architecture first. Then production.

A practical technical discussion focused on SIP, media, tenants, AI and the delivery path — not a generic sales deck.