In any modern work environment, whether a small company or a large enterprise, a single network now carries different types of data traffic simultaneously: computer data, Voice over IP (VoIP) calls, Internet of Things (IoT) devices, and sometimes surveillance cameras.
Having all these types on the same network without proper organization often leads to slow calls, voice choppiness, and general congestion in data traffic. This is where Voice VLAN technology comes in, provided by Grandstream switches as a practical and effective solution to separate voice traffic from other types of data. This ensures excellent connection quality for IP phones without affecting other devices connected to the network.
In this article, we will provide a detailed explanation of the Voice VLAN concept, how to configure it step by step on Grandstream switches, and a comparison between some of these switch models to help you choose the most suitable one for your needs.
What is Voice VLAN and Why is it Important?
A VLAN is a technology that allows a single physical network to be divided into several separate logical networks, so that devices behave as if they are on completely different networks even though they are connected to the same physical switch. Voice VLAN is the allocation of an independent logical network exclusively for voice traffic, separating it from regular data traffic coming from computers, printers, and other devices.
The importance of this technology is clearly evident in the following points:
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Giving higher priority to voice data packets (QoS) to reduce latency and choppiness during calls.
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Reducing conflicts between delay-sensitive voice traffic and less sensitive regular data traffic.
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Simplifying network management, as the administrator can handle the voice network separately from the rest of the networks.
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Enhancing security, because separating voice traffic from other devices reduces the likelihood of eavesdropping or unauthorized access to company calls.
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Facilitating future expansion, as adding new phones or moving them between offices becomes much easier when a dedicated VLAN for voice exists.
Since Grandstream switches are designed to be part of an integrated communications solution that includes IP phones and UCM systems, they provide strong and direct support for this technology, whether through manual or automatic configuration.
Why are Grandstream Switches a Good Choice for This Purpose?
When talking about Grandstream switches, we are referring to a class of managed network switches specifically designed to integrate seamlessly with other Grandstream products such as IP phones, UCM systems, and wireless access points. Among their most prominent features in the context of Voice VLAN setup are:
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Full support for the LLDP-MED protocol, which allows automatic detection of IP phones and direct routing to the voice network.
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The ability to manage multiple switches simultaneously through platforms such as GWN.Cloud or GWN Manager, which is very useful for companies with more than one branch.
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A relatively clear user interface compared to many other professional switches.
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Support for the Auto Voice VLAN feature, which greatly simplifies the setup process without the need to configure each port manually.
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Direct compatibility with Grandstream phones themselves, making the connection process between the phone and the switch smoother in practice.
Steps to Manually Configure Voice VLAN on Grandstream Switches
Before starting to configure Voice VLAN, you must already have a separate VLAN dedicated to voice and another for regular data. The basic steps are as follows:
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Access the switch management interface via a web browser using the device's IP address, or through the GWN.Cloud platform if the switch is registered there.
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Go to the Switching menu, then select the VLAN section.
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Create a new VLAN and assign it a distinct number (for example, VLAN 20 for voice traffic and VLAN 10 for data traffic).
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Add a brief description for each VLAN to make it easier to identify later in the VLANs list.
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Specify the ports (Ports) that will be part of each VLAN, and determine whether they are Tagged or Untagged according to the nature of the connected device.
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Set the link type for each port (Access, Trunk, or Hybrid), ensuring that any port connecting switches to each other or to a router is set as Trunk to allow multiple VLANs to pass through it.
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Go to the Voice VLAN tab within the same menu, enable the option, and then specify the VLAN number that will be dedicated to voice traffic.
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Save the settings and re-verify that the phone connected to the desired port has actually obtained an IP address from the voice network range.
It is important to note that the phone must support a PC port if you need to connect a computer through it, as this is what allows regular data traffic to pass through the same cable while logically separating it from voice traffic using tags.
Configuring Auto Voice VLAN Using LLDP-MED
Instead of configuring each port manually, Grandstream switches offer the Auto Voice VLAN feature, which relies on the LLDP-MED protocol to automatically detect connected IP phones and direct them to the voice VLAN. The activation steps are as follows:
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Go to Switching → VLAN → Voice VLAN tab.
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Choose Auto Voice VLAN mode instead of manual mode.
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Specify the VLAN number dedicated to voice.
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Enable the LLDP-MED Network Policy automatically via the Auto Config option, or configure it manually from the Maintenance → LLDP → LLDP-MED menu.
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Apply the voice network policy to all required ports through LLDP MED Port Settings.
Once this feature is activated, any IP phone that supports LLDP-MED will automatically receive the voice VLAN tag as soon as it is connected to the switch, while any other device connected via the phone’s PC port remains on the regular data network.
Comparison Between Some Grandstream Switches
Grandstream switches vary in the number of ports, PoE support, and transfer speed, which directly affects their ability to handle large numbers of phones and devices in a Voice VLAN environment. The following table provides a general comparison between some common models:
|
Model |
Suitable For |
PoE Support |
Voice VLAN Support |
Number of Ports |
|
GWN7801 |
Small offices and basic networks |
No |
Yes |
8 Gigabit + 2 SFP |
|
GWN7802P |
Small to medium offices using IP phones and wireless APs |
Yes (PoE+) |
Yes |
16 Gigabit + 2 SFP |
|
GWN7803P |
Medium companies and branches with more devices |
Yes (PoE+) |
Yes |
24 Gigabit + 4 SFP |
|
GWN7806 |
Large networks needing many ports and inter-floor/building connections |
Depends on version |
Yes |
48 Gigabit + 4 SFP |
|
GWN7811P / GWN7813P |
Large enterprises and professional networks requiring high performance and advanced management |
Yes (PoE/PoE+), supports PoE++ on some ports in GWN7813P |
Yes with Auto Voice VLAN and LLDP-MED |
8 to 24 Gigabit with 10G SFP+ ports |
The larger the organization and the greater the number of IP phones, the better it is to choose models that fully support PoE, such as the GWN7810 or GWN7813 series. These reduce the need for separate power sources for each phone and make network and voice management more flexible.
Best Practices When Setting Up Voice VLAN
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Assign a clear and logical VLAN number for the voice network to make it easy to distinguish from other networks during later reviews.
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Ensure that all Trunk ports connecting switches allow both the voice VLAN and data VLAN to pass through.
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Enable Quality of Service (QoS) alongside Voice VLAN to ensure actual priority is given to voice packets, not just logical separation.
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Use strong passwords to access the switch management interface, as controlling VLAN settings grants sensitive privileges on the network.
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In case of multiple branches or multiple switches, it is preferable to use the GWN.Cloud or GWN Manager platform to unify settings and reduce human errors.
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Test the configuration immediately after completion by verifying that the phone receives the correct IP address within the voice network range and that call quality is good and free of choppiness.
Common Problems and Solutions
Some of the most common issues users face when setting up Voice VLAN on Grandstream switches:
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Phone does not receive IP address from the voice range: Usually caused by LLDP-MED not being enabled on the port connected to the phone, or the phone itself not supporting the protocol. In this case, manually check the phone settings.
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Computer connected via the phone’s PC port loses connection: Often due to incorrect configuration of the data VLAN on the same port. Review the Tagged and Untagged settings for the relevant port.
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Voice traffic does not pass between two different switches: Usually because the linking port between them is not configured as a Trunk port that allows the voice VLAN to pass.
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Call quality deteriorates despite having Voice VLAN: May be due to QoS settings not being properly enabled, or network congestion caused by other devices consuming significant bandwidth.
Conclusion
Setting up Voice VLAN is one of the essential steps that any organization relying on voice communications over the network should take, especially when using Grandstream switches that provide flexible and relatively easy tools to implement this task, whether manually or through the LLDP-MED-based Auto Voice VLAN feature.
Choosing the right Grandstream switch model, while considering the number of ports and PoE support, plays a major role in the success and long-term stability of the project, especially in environments containing a large number of IP phones and connected devices at the same time.
Find more:
Grandstream Switches & VLAN Support for Better Networks
Grandstream GWN Switch Series | Network Solutions
How Grandstream GWN7700 Switches Improve Your Network?
Best Network Switches in KSA – Grandstream - DrayTek - Ruijie