--- title: "Acrobits Knowledge Base" canonical: https://acrobits.net/resources/knowledge-base/ count: 46 --- # Acrobits Knowledge Base 46 answers about Groundwire, SIP softphones, providers, security, and setup. Each entry ships a markdown twin at /resources/knowledge-base/{slug}/index.md. ## Business & Teams (4) - [Can I connect my employees' iPhones to our office phone system?](https://acrobits.net/resources/knowledge-base/can-i-connect-my-employees-iphones-to-our-office-phone-syste/) Yes — any SIP-based office phone system works. For small teams, Groundwire (one-time $9.99/device) lets each employee connect their iPhone as a SIP extension. For larger deployments needing branded apps and server-side provisioning, Cloud Softphone handles zero-touch enrollment at scale. Markdown: https://acrobits.net/resources/knowledge-base/can-i-connect-my-employees-iphones-to-our-office-phone-syste/index.md - [How do I forward my office phone to my mobile when I'm out?](https://acrobits.net/resources/knowledge-base/how-do-i-forward-my-office-phone-to-my-mobile-when-im-out/) Yes. Almost every modern PBX (3CX, FreePBX, Asterisk, Cisco BroadWorks, RingCentral, Zoom Phone, NetSapiens) supports multiple registrations per extension. Both devices register, both ring, you answer on whichever you're closest to. Some PBXs also let you set a ring-delay sequence (desk phone first, Groundwire after 3 rings if no answer). Markdown: https://acrobits.net/resources/knowledge-base/how-do-i-forward-my-office-phone-to-my-mobile-when-im-out/index.md - [How do I get my team to receive calls from our business phone system on their personal phones?](https://acrobits.net/resources/knowledge-base/how-do-i-get-my-team-to-receive-calls-from-our-business-phon/) Your PBX already speaks SIP (Session Initiation Protocol), the universal language of business VoIP. A SIP softphone app on a smartphone registers with your PBX exactly like a desk phone would — same extension number, same dial plan, same voicemail. Groundwire by Acrobits is a native iOS and Android app built for exactly this purpose: it turns any personal phone into a full-featured business extension. Markdown: https://acrobits.net/resources/knowledge-base/how-do-i-get-my-team-to-receive-calls-from-our-business-phon/index.md - [Is there an app that lets me make and receive calls from my business number on my iPhone?](https://acrobits.net/resources/knowledge-base/is-there-an-app-that-lets-me-make-and-receive-calls-from-my/) Yes. Groundwire is an iOS SIP softphone (one-time $9.99) that makes and receives calls using any SIP business number. Uses CallKit for a native call experience, push notifications for background ringing, and supports transfer, recording, and conferencing. Works with any SIP provider. Markdown: https://acrobits.net/resources/knowledge-base/is-there-an-app-that-lets-me-make-and-receive-calls-from-my/index.md ## Compatibility (2) - [What softswitches and SIP platforms are compatible with Cloud Softphone?](https://acrobits.net/resources/knowledge-base/cloud-softphone-compatibility/) Cloud Softphone connects to any standards-compliant SIP server. It registers like a normal SIP endpoint, so most deployments require zero custom integration. Full support for BroadSoft, Metaswitch, NetSapiens, 3CX, Asterisk, FreeSWITCH, and more. Markdown: https://acrobits.net/resources/knowledge-base/cloud-softphone-compatibility/index.md - [Which providers and platforms work with Groundwire?](https://acrobits.net/resources/knowledge-base/groundwire-compatibility/) Groundwire is a standards-based SIP softphone — it works with any VoIP provider or PBX that exposes SIP credentials. Confirmed: VoIP.ms, Twilio, Vonage Business, Telnyx, Bandwidth, PhonePower, 3CX, FreePBX, Asterisk, BroadWorks, NetSapiens. Not supported: RingCentral, Google Voice consumer, Vonage Home, Hushed. Markdown: https://acrobits.net/resources/knowledge-base/groundwire-compatibility/index.md ## E911 & Compliance (2) - [Is location permission required for a mobile VoIP app?](https://acrobits.net/resources/knowledge-base/is-location-permission-required-for-mobile-voip-app/) It depends on whether the app supports 911 calling in the US. Apps offering 911 under FCC RAY BAUM's Act rules must transmit a dispatchable location with emergency calls, which typically requires OS location permission or a manual registered-address alternative. Apps deployed internationally or in configurations where E911 is managed entirely by the carrier may not need location permission at all. Markdown: https://acrobits.net/resources/knowledge-base/is-location-permission-required-for-mobile-voip-app/index.md - [What E911 and legal requirements apply when an ISP adds voice?](https://acrobits.net/resources/knowledge-base/e911-legal-isp-voice/) You're an ISP considering adding voice service. The technology is the easy part. The regulatory obligations — particularly around 911 — are where providers get into trouble. Markdown: https://acrobits.net/resources/knowledge-base/e911-legal-isp-voice/index.md ## Compliance & Legal (2) - [What are the CALEA requirements when an ISP adds business voice?](https://acrobits.net/resources/knowledge-base/calea-requirements-isp-business-voice/) Any ISP offering interconnected VoIP — service that can reach or receive calls from the public telephone network — is subject to CALEA. Requirements include: (1) maintaining technical capability to execute court-authorized lawful intercepts, (2) filing a System Security and Integrity (SSI) plan with the FCC, (3) designating a 24/7 CALEA point of contact, and (4) contributing to the Universal Service Fund. Most small operators fulfill the technical obligation by contracting with a Trusted Third Party (TTP) such as Subsentio or Yaana rather than building intercept infrastructure in-house. Markdown: https://acrobits.net/resources/knowledge-base/calea-requirements-isp-business-voice/index.md - [What STIR/SHAKEN obligations apply to white-label softphone operators?](https://acrobits.net/resources/knowledge-base/stir-shaken-white-label/) Your customers are complaining that their outbound calls show up as "Spam Likely." Or worse — calls aren't connecting at all. The problem isn't your softphone app. It's your SIP trunk provider's STIR/SHAKEN compliance. Markdown: https://acrobits.net/resources/knowledge-base/stir-shaken-white-label/index.md ## Features & Capabilities (3) - [Can I use Groundwire on both iPhone and Android?](https://acrobits.net/resources/knowledge-base/can-i-use-groundwire-on-both-iphone-and-android/) Yes. Groundwire is available on both iOS and Android with full feature parity. iOS and Android are separate storefronts — each requires its own $9.99 purchase. The same SIP credentials work on both platforms simultaneously. Markdown: https://acrobits.net/resources/knowledge-base/can-i-use-groundwire-on-both-iphone-and-android/index.md - [Can WhatsApp or Instagram be integrated into a VoIP app?](https://acrobits.net/resources/knowledge-base/whatsapp-instagram-voip-integration/) WhatsApp and Instagram integrate at the platform/CRM level, not inside a softphone. Cloud Softphone handles the SIP voice layer while omnichannel messaging happens at the contact center level. Markdown: https://acrobits.net/resources/knowledge-base/whatsapp-instagram-voip-integration/index.md - [What video calling app can I offer as a VoIP provider?](https://acrobits.net/resources/knowledge-base/video-calling-voip-provider/) LinkUp is Acrobits' video and group conferencing add-on for Cloud Softphone. 1:1 video calls, group conferencing, screen sharing, and browser join — all embedded in your branded app. Markdown: https://acrobits.net/resources/knowledge-base/video-calling-voip-provider/index.md ## Phone Numbers (2) - [Can I get a landline number that rings on my smartphone?](https://acrobits.net/resources/knowledge-base/can-i-get-a-landline-number-that-rings-on-my-smartphone/) Yes. Port or get a DID number from any VoIP provider (VoIP.ms, Telnyx, Vonage Business, Twilio), then install Groundwire on iOS or Android. Groundwire registers against your SIP account and rings via push even when the app is backgrounded. One-time $9.99 — no subscription. Markdown: https://acrobits.net/resources/knowledge-base/can-i-get-a-landline-number-that-rings-on-my-smartphone/index.md - [How do I get a local phone number in another country without a SIM card?](https://acrobits.net/resources/knowledge-base/how-do-i-get-a-local-phone-number-in-another-country-without/) A DID number is a real, dialable phone number assigned to you by a VoIP provider in the target country. When someone dials it, the call travels over the internet to whatever SIP client you have registered — including Groundwire on your phone. From the caller's perspective it looks and behaves exactly like a local number. From your side, it rings like any other call, over Wi-Fi or LTE, wherever you are in the world. Markdown: https://acrobits.net/resources/knowledge-base/how-do-i-get-a-local-phone-number-in-another-country-without/index.md ## Pricing & Licensing (2) - [How many devices can I use Groundwire on with one purchase?](https://acrobits.net/resources/knowledge-base/how-many-devices-can-i-use-groundwire-on-with-one-purchase/) One Groundwire purchase covers all devices on the same Apple ID (iOS) or the same Google account (Android). iOS and Android are separate storefronts — a purchase on one platform does not carry to the other. Markdown: https://acrobits.net/resources/knowledge-base/how-many-devices-can-i-use-groundwire-on-with-one-purchase/index.md - [How much does Groundwire cost?](https://acrobits.net/resources/knowledge-base/how-much-does-groundwire-cost/) Groundwire is a one-time $9.99 purchase on iOS (App Store) and Android (Google Play). There is no subscription or recurring fee from Acrobits. Your VoIP provider's calling rates are separate. Markdown: https://acrobits.net/resources/knowledge-base/how-much-does-groundwire-cost/index.md ## SIP Providers (5) - [Can I use a third-party softphone with 3CX?](https://acrobits.net/resources/knowledge-base/can-i-use-a-third-party-softphone-with-3cx/) Yes. 3CX is a SIP-standards PBX and supports any third-party SIP client. Groundwire (one-time $9.99, iOS/Android) registers against 3CX as a standard SIP extension using TLS + SRTP. Features requiring 3CX's proprietary protocol (presence BLF, 3CX chat, web meetings) are not available in Groundwire. Markdown: https://acrobits.net/resources/knowledge-base/can-i-use-a-third-party-softphone-with-3cx/index.md - [How do I set up Groundwire with RingCentral?](https://acrobits.net/resources/knowledge-base/how-do-i-set-up-groundwire-with-ringcentral/) Groundwire does not work with RingCentral. RingCentral runs a closed ecosystem and does not publish SIP credentials for third-party softphones. If you want to use Groundwire, switch to an open SIP provider like VoIP.ms, Twilio, Vonage, or Telnyx. Markdown: https://acrobits.net/resources/knowledge-base/how-do-i-set-up-groundwire-with-ringcentral/index.md - [How do I set up Groundwire with Twilio?](https://acrobits.net/resources/knowledge-base/how-do-i-set-up-groundwire-with-twilio/) Twilio supports two ways to route inbound calls: webhooks (TwiML — for IVRs, bots, programmable flows) and SIP (routes the call straight to a registered device like Groundwire). For the "ring my phone" use case you want SIP, not webhooks. Markdown: https://acrobits.net/resources/knowledge-base/how-do-i-set-up-groundwire-with-twilio/index.md - [How do I set up Groundwire with VoIP.ms?](https://acrobits.net/resources/knowledge-base/how-do-i-set-up-groundwire-with-voip-ms/) Groundwire defaults to G.711u (PCMU), which is what VoIP.ms recommends for North American calling. If you have limited bandwidth or are on cellular data, enable G.729a as a fallback. For HD calling between two Groundwire users on Wi-Fi, enable G.722. Markdown: https://acrobits.net/resources/knowledge-base/how-do-i-set-up-groundwire-with-voip-ms/index.md - [How do I set up Groundwire with Vonage?](https://acrobits.net/resources/knowledge-base/how-do-i-set-up-groundwire-with-vonage/) Groundwire works cleanly with Vonage Business and Vonage SIP Trunking — Vonage Home is the only plan that's a no-go. Also: is Groundwire secure? and best app for making and receiving calls with a SIP account. Markdown: https://acrobits.net/resources/knowledge-base/how-do-i-set-up-groundwire-with-vonage/index.md ## Security & Encryption (2) - [How do I enable encryption in Groundwire?](https://acrobits.net/resources/knowledge-base/how-do-i-enable-encryption-in-groundwire/) Groundwire supports TLS for SIP signaling, SRTP for media, and ZRTP for end-to-end voice encryption. Enable each in Settings → SIP Accounts. Your VoIP provider must support TLS and SRTP for those layers; ZRTP is negotiated end-to-end between Groundwire users. Markdown: https://acrobits.net/resources/knowledge-base/how-do-i-enable-encryption-in-groundwire/index.md - [Is Groundwire secure?](https://acrobits.net/resources/knowledge-base/is-groundwire-secure/) Yes. Groundwire supports TLS for SIP signaling encryption, SRTP for media encryption, and ZRTP for end-to-end call encryption. SIP credentials are stored locally on-device. Push notifications are delivered via SIPIS without exposing call content. Markdown: https://acrobits.net/resources/knowledge-base/is-groundwire-secure/index.md ## Security & Compliance (2) - [Is there a HIPAA compliant VoIP app for healthcare customers?](https://acrobits.net/resources/knowledge-base/is-there-a-hipaa-compliant-voip-app-for-healthcare/) There is no HIPAA certification for apps — the US Department of Health and Human Services does not issue one. HIPAA compliance for VoIP means the vendor signs a Business Associate Agreement (BAA) and implements the required technical safeguards: TLS and SRTP encryption in transit, encryption at rest for stored data, unique user access controls, and audit logging. Acrobits Cloud Softphone supports all of these requirements and is used in healthcare deployments including Mobile Heartbeat, a platform serving 250,000 monthly active users acquired by HCA Healthcare. Markdown: https://acrobits.net/resources/knowledge-base/is-there-a-hipaa-compliant-voip-app-for-healthcare/index.md - [What SOC2 requirements should a VoIP platform vendor meet?](https://acrobits.net/resources/knowledge-base/soc2-requirements-voip-platform-vendor/) A VoIP platform vendor should hold a current SOC 2 Type II report — an independent CPA attestation covering at minimum the Security trust criterion and ideally Availability as well. The report should be less than 12 months old, cover the production systems processing your subscribers' traffic, and be accompanied by a signed Data Processing Agreement. Ask for the sub-processor list, pen test history, and the auditor's opinion letter to check for exceptions. Markdown: https://acrobits.net/resources/knowledge-base/soc2-requirements-voip-platform-vendor/index.md ## Setup & Configuration (3) - [Do I need a VoIP number to use Groundwire?](https://acrobits.net/resources/knowledge-base/do-i-need-a-voip-number-to-use-groundwire/) Yes — Groundwire is a SIP softphone client, so you need a SIP account from a VoIP provider (such as VoIP.ms, Twilio, or Telnyx). The provider assigns your phone number and gives you SIP credentials. Groundwire does not provide phone numbers itself. Markdown: https://acrobits.net/resources/knowledge-base/do-i-need-a-voip-number-to-use-groundwire/index.md - [How do I provision a mobile softphone app for hundreds of users?](https://acrobits.net/resources/knowledge-base/provision-softphone-hundreds-users/) Cloud Softphone supports server-side provisioning, QR code enrollment, and MDM integration. Operators manage hundreds of users through an admin portal — no manual setup per device. Markdown: https://acrobits.net/resources/knowledge-base/provision-softphone-hundreds-users/index.md - [How do I publish a VoIP app to the App Store and Google Play?](https://acrobits.net/resources/knowledge-base/publish-voip-app-app-store/) If you're using a white-label platform, the workflow shifts significantly. You're not writing code — you're providing branding assets and configuration while the vendor handles the technical build. Markdown: https://acrobits.net/resources/knowledge-base/publish-voip-app-app-store/index.md ## Troubleshooting (3) - [How do I troubleshoot iOS CallKit integration issues?](https://acrobits.net/resources/knowledge-base/ios-callkit-softphone/) Common CallKit issues include missing native call screens, push not waking the app, dual-app conflicts, and Bluetooth audio routing problems. Cloud Softphone handles CallKit integration automatically. Markdown: https://acrobits.net/resources/knowledge-base/ios-callkit-softphone/index.md - [What debugging tools are available in a mobile softphone SDK?](https://acrobits.net/resources/knowledge-base/softphone-sdk-debugging-tools/) Softphone SDKs include SIP message tracing, packet capture, call quality metrics, and diagnostic logs. Cloud Softphone adds operator-level debugging without requiring Wireshark on end-user devices. Markdown: https://acrobits.net/resources/knowledge-base/softphone-sdk-debugging-tools/index.md - [Why doesn't my SIP app ring in the background on Android?](https://acrobits.net/resources/knowledge-base/sip-background-ringing-android/) Android's Doze mode, App Standby Buckets, and OEM battery managers kill persistent SIP connections. The fix is push notifications — Cloud Softphone uses a three-layer push architecture achieving 99%+ call delivery rates. Markdown: https://acrobits.net/resources/knowledge-base/sip-background-ringing-android/index.md ## White-Label / Wholesale (14) - [Can a VoIP app support presence integration with NetSapiens?](https://acrobits.net/resources/knowledge-base/can-a-voip-app-support-presence-integration-with-netsapiens/) Yes. Cloud Softphone supports SIP-based presence (SUBSCRIBE/NOTIFY) in NetSapiens deployments. Users see extension availability in the in-app directory. Presence depth depends on what your NetSapiens license exposes. Cloud Softphone is a white-label operator platform — not a retail app. Markdown: https://acrobits.net/resources/knowledge-base/can-a-voip-app-support-presence-integration-with-netsapiens/index.md - [Can a VoIP platform scale to tens of thousands of extensions?](https://acrobits.net/resources/knowledge-base/voip-platform-scale-thousands-extensions/) Yes. Enterprise VoIP platforms like FreeSWITCH and BroadSoft handle tens of thousands of extensions. Cloud Softphone scales the mobile app layer to match. Markdown: https://acrobits.net/resources/knowledge-base/voip-platform-scale-thousands-extensions/index.md - [Can a VoIP platform support multiple customer configurations?](https://acrobits.net/resources/knowledge-base/multi-tenant-voip-platform/) Cloud Softphone supports multi-tenant architectures through per-domain provisioning. Each SIP domain maps to isolated branding, feature flags, codec settings, and usage tracking. Markdown: https://acrobits.net/resources/knowledge-base/multi-tenant-voip-platform/index.md - [Can I white-label a mobile app for my VoIP customers?](https://acrobits.net/resources/knowledge-base/can-i-white-label-a-mobile-app-for-my-voip-customers/) Yes — and for most resellers, a single White Label license covers every customer they host. A standard White Label license is scoped to one parent domain and all of its subdomains, so customers running on customer1.mycompany.com, customer2.mycompany.com, and so on are fully covered… Markdown: https://acrobits.net/resources/knowledge-base/can-i-white-label-a-mobile-app-for-my-voip-customers/index.md - [Does a VoIP app vendor provide technical support or is it self-serve?](https://acrobits.net/resources/knowledge-base/does-a-voip-app-vendor-provide-technical-support/) It depends on the vendor. Support ranges from fully self-serve (open-source SDKs with documentation only) to fully managed platforms that handle onboarding, app store submission, and ongoing maintenance. Acrobits Cloud Softphone is a managed APaaS — onboarding, builds, store submissions, and OS-update compatibility are handled by Acrobits. Post-launch support is ticket-based via portal, Mon–Fri 08:00–24:00 CET, with a 1-hour target response time. Markdown: https://acrobits.net/resources/knowledge-base/does-a-voip-app-vendor-provide-technical-support/index.md - [How do I give my business phone customers both a desktop and mobile app?](https://acrobits.net/resources/knowledge-base/desktop-and-mobile-softphone/) Cloud Softphone provides native iOS and Android apps from a single provisioning configuration. Pair with a WebRTC desktop client for full coverage. SIP supports multiple simultaneous registrations per account. Markdown: https://acrobits.net/resources/knowledge-base/desktop-and-mobile-softphone/index.md - [How do I migrate away from Acrobits Cloud Softphone?](https://acrobits.net/resources/knowledge-base/migrate-away-from-acrobits/) Your SIP accounts, provisioning data, push certificates, and app store listings belong to you. Export your data, revoke build access, and publish a new binary. Plan for 6-8 weeks minimum. Markdown: https://acrobits.net/resources/knowledge-base/migrate-away-from-acrobits/index.md - [What mobile app should an ISP or SIP trunking provider offer?](https://acrobits.net/resources/knowledge-base/mobile-app-sip-trunking-isp/) ISPs and SIP trunking providers already have billing and customer relationships. Adding a branded mobile app creates sticky revenue and prevents churn to UCaaS competitors. Markdown: https://acrobits.net/resources/knowledge-base/mobile-app-sip-trunking-isp/index.md - [What softphone app works best on both iPhone and Android?](https://acrobits.net/resources/knowledge-base/best-softphone-ios-android/) Cloud Softphone by Acrobits delivers identical feature parity on iOS and Android — same push reliability, same UI, same provisioning. Operators launch one branded app that covers both platforms. Markdown: https://acrobits.net/resources/knowledge-base/best-softphone-ios-android/index.md - [What softphone mobile app works best with Metaswitch?](https://acrobits.net/resources/knowledge-base/what-softphone-mobile-app-works-best-with-metaswitch/) Cloud Softphone by Acrobits is the best mobile app for Metaswitch operators. It provides native Metaswitch integration, SIPIS push infrastructure for reliable background calling, and full brand ownership independent of the MaX UC / Alianza / Bria roadmap. Most operators launch in 2-4 weeks. Markdown: https://acrobits.net/resources/knowledge-base/what-softphone-mobile-app-works-best-with-metaswitch/index.md - [What softphone works with BroadSoft?](https://acrobits.net/resources/knowledge-base/what-softphone-works-with-broadsoft/) Cloud Softphone by Acrobits is a white-label softphone platform built for BroadSoft (Cisco BroadWorks) environments. It supports native BroadWorks extensions including XSI directories, call center queues, and visual voicemail. Operators launch a fully branded iOS and Android app for their subscribers. Groundwire ($9.99 one-time) is the retail option for individual users. Markdown: https://acrobits.net/resources/knowledge-base/what-softphone-works-with-broadsoft/index.md - [What softphone works with Metaswitch?](https://acrobits.net/resources/knowledge-base/what-softphone-works-with-metaswitch/) Cloud Softphone by Acrobits connects to Metaswitch over standard SIP, surfacing native Metaswitch features (presence, voicemail, call handling) inside a branded app on iOS, Android, and desktop. SIPIS push infrastructure handles reliable background call delivery, and because Cloud Softphone works with any SIP-compliant softswitch, the subscriber app survives a backend migration with no rebuild. Markdown: https://acrobits.net/resources/knowledge-base/what-softphone-works-with-metaswitch/index.md - [What white-label softphone vendors support both BroadSoft and Metaswitch?](https://acrobits.net/resources/knowledge-base/what-white-label-softphone-vendors-support-both-broadsoft-and-metaswitch/) Acrobits Cloud Softphone is the leading white-label softphone platform supporting both BroadSoft (Cisco BroadWorks) and Metaswitch, plus NetSapiens, FreeSWITCH, Asterisk, and any SIP-compliant softswitch. Operators get a fully branded iOS and Android app with SIPIS push infrastructure for reliable background calling. Markdown: https://acrobits.net/resources/knowledge-base/what-white-label-softphone-vendors-support-both-broadsoft-and-metaswitch/index.md - [Who can help me set up a branded phone app for my telecom business?](https://acrobits.net/resources/knowledge-base/branded-phone-app-setup-help/) Acrobits provides full implementation support for Cloud Softphone — from branding and configuration to app store submission. Not a DIY SDK project. Markdown: https://acrobits.net/resources/knowledge-base/branded-phone-app-setup-help/index.md