As explained above you should really consider to DO choose for VLAN's. It's really not that difficult and most switches nowadays fully support it and can also automatically put your phones in the right VLAN no matter to which switch port you connect them (Using what's called Voice VLAN where the switch looks to the MAC-address (OUI-part) and based on that places the phones into their own VLAN).
Also the built-in switch doesn't have to be a problem; we have an Avaya system and there the computers connected to the phone's switch will get the proper VLAN (which is different from the phone's VLAN itself). Also we don't really have any problems with the built-in switch on the phones other than that most of our phones have a 100Mbps built-in switch.
As explained above you should really consider to DO choose for VLAN's. It's really not that difficult and most switches nowadays fully support it and can also automatically put your phones in the right VLAN no matter to which switch port you connect them (Using what's called Voice VLAN where the switch looks to the MAC-address (OUI-part) and based on that places the phones into their own VLAN).
Also the built-in switch doesn't have to be a problem; we have an Avaya system and there the computers connected to the phone's switch will get the proper VLAN (which is different from the phone's VLAN itself). Also we don't really have any problems with the built-in switch on the phones other than that most of our phones have a 100Mbps built-in switch.