# Hanging & Deadlocked Channel Scrubbing

To prevent stale voice sessions from accumulating across server network ports, **Asterisk 2** runs automated **Channel Garbage Collectors**. The service identifies non-communicative call paths to clear abandoned hardware slots automatically.

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## Deadlock Detection & Scrubbing Pipeline

The chart below details the maintenance sweep isolating disconnected telephone endpoints:

```mermaid
graph TD
    %% Sweeper
    subgraph MaintenanceCron["Background Garbage Collection"]
        TriggerSweep["Active Channel Monitor Task<br/>(Executes Sweep Every 60 Seconds)"]
    end

    %% Evaluation
    subgraph SessionCheck["Telemetry Audit Layer"]
        CheckState["Audit Cached Channel Inactivity<br/>(Last Received Signaling Frame &gt; 3600s)"]
    end

    %% Drop Target
    subgraph TeardownTarget["API Termination Engine"]
        ExecPurge["DELETE /ari/channels/{id}<br/>(Force Channel Dissolution)"]
    end

    %% Links
    TriggerSweep ==>|"Query Concurrent Cache Maps"| CheckState
    CheckState ==>|"Unresponsive Timeframe Identified"| ExecPurge

    %% High-Contrast Theming Palette
    classDef cronToken fill:#0f172a,stroke:#38bdf8,stroke-width:2px,color:#fff,rx:6px,ry:6px;
    classDef chkToken fill:#1e293b,stroke:#a855f7,stroke-width:2px,color:#fff,rx:6px,ry:6px;
    classDef dropToken fill:#312e81,stroke:#ec4899,stroke-width:2px,color:#fff,rx:6px,ry:6px;

    class MaintenanceCron,TriggerSweep cronToken;
    class SessionCheck,CheckState chkToken;
    class TeardownTarget,ExecPurge dropToken;
```

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## Automated Scrubbing Parameters

### 1. Absolute Maximum Duration Bounds
To completely prevent orphaned telephone connections from locking GSM gateway channels overnight, global background configurations enforce absolute duration caps. Any individual voice session running past 4 hours continuous connection triggers automatic termination sweeps.

### 2. Stasis Context Cleanup Triggers
If client socket disconnects drop without firing normal websocket signaling frames, maintenance loops sweep operational channel lists to force memory cleanup across mapped dictionaries.