HP Vlan Configuration

Afternoon all,
                 I am after a quick reality check before i begin making changes to a local HP Switch. The client has just had a VOIP telecom system installed with with provider putting the following forward.

Vlan 171 - Data
Vlan 172 - Voip

HP 2620 - J9627A (ours)
Cisco - SF300

Internal phones are on the same connection Patch > Wall > Phone > PC and as such we need to ensure data and Voip is allowed on the HP ports do i need to ensure now that all ports are "tagged" for both Vlan's?

DHCP - On Vlan 172 is from a Cisco Switch
DHCP - On Vlan 171 is from DHCP server (2008)



the Voip provider has informed me that unless they provide the DHCP they will not be able to authenticate the handsets correct... or something like that.....