Built as a SIP softphone path for broader use after internal testing and release readiness work.
MD3 Softphone
A SIP softphone for business calls that need more than a dial pad.
MD3 Softphone is in internal testing as a practical endpoint for SIP users, enterprise front desks, call center agents, and future PBX-aware workflows.
Development screenshots
Built for users who handle calls as work, not just conversations.
MD3 Softphone is being shaped for enterprise operators, front desk teams, and call center agents who need reliable line visibility, fast transfers, and a path toward caller-aware workflow.
- Android app planned for Google Play after development and testing
- Windows .NET 8 / WPF softphone for customer-specific front desk and call center use
- SIP registration and inbound/outbound calling workflows
- Configurable multi-line support with contacts, hold, transfer, and merge workflows
- Optional drag-based call control for blind transfer and line-to-line merge
- G.711 and Opus media path with RTP handling
- Designed as one possible endpoint in a future PBX-aware workflow
- macOS and iOS planned as later platform targets if the product direction continues to grow
Development screenshots
Product Direction
Two active platform paths, with Apple platforms planned next.
The Android app is planned for Google Play after development and testing, where it can serve any SIP user. The Windows build is aimed at customer-specific enterprise use: front desks, office teams, and call center agents who need multi-line handling and transfer workflows. If the product direction continues to grow, macOS and iOS are planned as later platform targets.
Designed for front desk and call center workflows where multi-line state and transfers matter.
Softphone Call Control
Multi-line calling should make transfer and merge feel like moving work, not hunting through menus.
The Windows softphone direction includes optional drag-based actions: move a contact card onto an active call for blind transfer, or move one call line onto another to merge the conversation. If a customer prefers conventional controls, the gesture layer can be disabled.
Quick ContactsMarcus J. Sterlingdrag contact to call
Line 2Active callblind transfer target
Line 1Held calldrag onto Line 2
ResultMerge / conferenceline-to-line action
PBX-Aware Endpoint
The softphone can become one endpoint inside a larger workflow.
Standard SIP phones will still matter. The MD3 Softphone direction is for places where the endpoint should also understand caller context, click-to-call, CRM screen pop, and AI-assisted call notes.
01Call stateLine, hold, transfer, merge, and call direction.
02Record contextCRM or case surface opens around the caller.
03Click-to-callOutbound calls can start from the business record.
04AI assistCaptured call notes and follow-up can land in the right place.
Current Boundary
Public wording stays careful while the product is in internal testing.
The site can discuss the direction, screenshots, and tested call-handling concepts, but it should not imply that MD3 Softphone has already launched commercially.
Next Step
Discuss a softphone or endpoint workflow.
The current work can support Android release planning, Windows customer customization, and PBX-aware integrations around caller context and click-to-call.