The company I work use Grand stream Phones 1625 model, I have noticed that phones do not work properly when the interface is been tagged with the voice vlan command (WS-C2960X-48TS-L). They recognized the gateway and receive an IP from voice vlan but when we test the line it produces a busy tone and unable to establish a phone connection. But If the port is tagged only for the voice vlan (in access and stand alone mode) works fine.
Below is the configuration (real vlans number were changed):
! switchport access vlan 45 ---> Data vlan
switchport trunk native vlan 45
switchport mode trunk
switchport voice vlan 15 ---> Voice vlan
spanning-tree portfast edge !
Switch is in RSTP mode and only 802.1Q is allowed (newer platform).
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