VoIP phones not shown in Catalyst 3560

I have 5 Avaya VoIP phones connected to my WS-C3560V2-48TS-S   layer 3 switch. The VoIP gets dhcp from the PBX. VoIP phones and PBX are connected to the switch with voice vlan 10. When I do sh ip arp, I don't see any VoIP phones. But when I do the sh mac address-table, I see their MAC addresses there. One thing I noticed is it will appear in the ARP table only after I ping the VoIP phone. Can somebody help me to make sense of this? Thanks

The WS-C3560X-24P-L   is a layer 2 switch, it routes packets based on MAC address and so its ARP table will not hold IP addresses unless the switch communicates directly with the device.  When you ping the phone, a connection is made and the ARP table notes the IP.

Still won't log MAC addresses, unless it needs to.