Babu,
If you are ruuning IOS, you have to configure "voice vlan" under the switch ports to configure the auxiliary vlan.
Conf t
int fa 0/1
switchport access vlan 1
switchport voice vlan 2 --> auxilary vlan.
If you are running CatOS, then you have to configure auxliary vlan.
Which Sup you are running? Please paste "show mod".
-amit singh