--- title: "D-Link models (DIR-615-628-825+) Configuration Guide" slug: "d-link-models-dir-615-628-825-configuration-guide" updated: 2026-03-03T17:28:06Z published: 2026-03-03T17:28:06Z canonical: "docs.ucstack.io/d-link-models-dir-615-628-825-configuration-guide" stale: true --- > ## Documentation Index > Fetch the complete documentation index at: https://docs.ucstack.io/llms.txt > Use this file to discover all available pages before exploring further. # D-Link models (DIR-615-628-825+) Configuration Guide ## **Introduction** This guide provides our recommended configuration for D-Link routers (DIR series, DGL series) to ensure optimal VoIP performance. --- ## **✅ Quick Checklist: Signs Your D-Link Router Needs VoIP Optimization** If you notice any of the following, this guide is for you: | **Symptom** | **Description** | | --- | --- | | **Phone deregistration** | Phones showing "Not Registered" when they shouldn't | | **One-way audio** | You can hear the other party, but they can't hear you (or vice versa) | | **Dropped calls** | Calls disconnect after a specific time period | | **No incoming calls** | Phone doesn't ring for incoming calls | | **Call transfer failures** | Parties can't hear each other after transfers | | **Call hold issues** | Audio doesn't return after placing a call on hold | ## **✅ Compatible D-Link Models** | **Series** | **Popular Models** | **Notes** | | --- | --- | --- | | **DIR Series** | DIR-615, DIR-628, DIR-825, DIR-855, DIR-860, DIR-868, DIR-878, DIR-882 | SIP ALG under Advanced > Firewall > SIP | | **DGL Series** | DGL-4100, DGL-4500, DGL-5500 | Gaming routers, same SIP ALG location | | **DSL Series** | DSL-2750, DSL-2900AL, DSL-2877AL, DSL-2888A | Modem/routers, SIP ALG under Advanced > Firewall | ## **Provider-Specific Requirements** > [!WARNING] > **Important:** You need to configure the following settings on your D-Link router. | **Requirement** | **Specification** | | --- | --- | | **IP Range to Whitelist** | `64.26.133.64/27` | | **Ports to Open** | UDP `5060-5061` (SIP) and UDP `10000-20000` (RTP) | | **SIP ALG** | Must be **DISABLED** | --- ## **Core Configuration Steps** ### **1. Disable SIP ALG (CRITICAL)** > [!CAUTION] > **Critical:** SIP ALG is enabled by default on most D-Link routers and MUST be disabled for proper VoIP operation. | **Navigation** | **Setting** | **Action** | | --- | --- | --- | | `Advanced > Firewall > SIP` | Log in to your router | Open browser to `192.168.0.1` or `192.168.1.1` | | Go to Advanced | Click **Advanced** tab at the top | | Navigate to Firewall | Click **Firewall** in the left menu | | Find SIP ALG setting | Look for **SIP**, **SIP ALG**, or **SIP Endpoint** | | Disable SIP ALG | ❌ **UNCHECK** the box and click **Save** | ### **2. Port Forwarding for VoIP** | **Navigation** | **Setting** | **Value** | | --- | --- | --- | | `Advanced > Port Forwarding` | **Name** | VoIP or SIP | | **Protocol** | UDP / Both | | **Start Port** | `5060` | | **End Port** | `5061` (SIP) and `10000-20000` (RTP) | | **IP Address** | Your VoIP device's IP (use static/reservation) | ### **3. Enable QoS for VoIP (Optional but Recommended)** | **Navigation** | **Setting** | **Action** | | --- | --- | --- | | `Advanced > QoS` | **Enable QoS** | ✅ **CHECK** Enable QoS | | **Priority** | Set **High priority** for VoIP device IP or ports | ### **4. Address Reservation (Static IP)** Ensure your VoIP device always receives the same IP address for port forwarding to work reliably. | **Navigation** | **Setting** | **Action** | | --- | --- | --- | | `Setup > Network Settings > DHCP Reservation` | Enable DHCP Reservation | Select your VoIP device from list | | Save Settings | Click **Save Settings** | > [!TIP] > **Pro tip:** After making changes, reboot your router and VoIP device for settings to take effect. --- ## **IP Whitelist Configuration** Create a port forwarding rule to allow traffic from our servers to reach your VoIP device. | **Field** | **Value** | | --- | --- | | **Name** | `VoIP-Provider` | | **Source IP** | `64.26.133.64/27` | | **Destination IP** | Your VoIP device's IP address | | **Protocol** | UDP / Both | | **Port Range** | `5060-5061` and `10000-20000` | > [!TIP] > **Note:** The `/27` notation includes **32 IP addresses** ranging from `64.26.133.64` to `64.26.133.95`. --- ## **✅ Configuration Checklist** | **#** | **Task** | | --- | --- | | 1 | **SIP ALG disabled** in Advanced > Firewall | | 2 | **Port forwarding** configured for SIP (5060-5061) and RTP (10000-20000) | | 3 | **QoS enabled** with VoIP priority (optional) | | 4 | **Address reservation** set for VoIP device | | 5 | **Whitelist rule created** for `64.26.133.64/27` | | 6 | **Test call successful** with two-way audio | --- ## **Verification & Testing** ### **SIP-ALG Verification Test** > [!NOTE] > **Test URL:** `http://mcstest.visualware.com/myspeed/myvoiph5_g711_sipalg.html` | **Item** | **Detail** | | --- | --- | | **Requirement** | Download the BCS utility when prompted | | **Expected Result** | `SIP ALG Firewall: N` | | **If Result Shows "Y"** | SIP-ALG is still active. Re-check Advanced > Firewall settings. | ### **Functional Testing** | **Test Case** | **Procedure** | **Expected Result** | | --- | --- | --- | | **Outbound Call** | Place call to external number | Two-way audio established | | **Inbound Call** | Call in from external number | Phone rings, call connects with two-way audio | | **Call Hold/Resume** | Place call on hold, then resume | Audio returns successfully | | **Call Transfer** | Transfer an active call | Transfer completes, parties can communicate | ## **🚨 Quick Troubleshooting** | **Issue** | **Most Likely Cause** | **Solution** | | --- | --- | --- | | **One-way audio** | SIP ALG still enabled | Re-check Advanced > Firewall > SIP | | **No incoming calls** | Port forwarding missing | Verify port forwarding for UDP 5060-5061 and 10000-20000 | | **Registration fails** | SIP ALG or IP conflict | Check SIP ALG status and use static IP for VoIP device | | **Phones re-registering constantly** | SIP ALG still interfering | Run SIP-ALG test and verify settings | ## **🛠️ Official D-Link Tutorials** For visual guidance on configuring your D-Link router, visit the official D-Link support page: 🔗 [**D-Link Support**](https://support.dlink.com/)