Use the SIP Soft Phone on the Voice VLAN

It is possible to use the SIP Soft Phone on a different VLAN (your voice VLAN). The support for this method is not within the application layer, so the SIP Soft Phone itself cannot accomplish this without help at lower layers. Third-party drivers for many Network Interface Cards (NICs) allow the support for multiple VLANs through a single NIC port by creating virtual adapters. When adding each VLAN to the configuration, it creates a new virtual NIC, which looks like a second physical NIC to the Operating System. The SIP Soft Phone configuration allows you to select which NIC to use for SIP and RTP. Selecting the virtual NIC that communicates on the voice VLAN binds that data to that NIC, which the NIC drivers then assign to the voice VLAN. For more information about whether your workstation's NIC supports this feature, consult the manufacturer.