For now I configured network setting on the phone and they are working fine but one better to know what is the solution .... [phone]---vl20[ERS4500]vl20----vl20[Cisco Catalyst]
all ports on the ERS 4500 is untagg all vlan member 20 (voice) only . port 48 connected to cisco catalyst port is sw mode access, sw access vlan 20 . DHCP server is on vl20 on the Catalyst. SO when I connect ip phone 9608 to any port of the ERS I will be in vlan 20 . I changed vlan id on the phone to 20 -waiting LLDP, to 0 waiting lldp , 802.1q to off to on waiting lldp

.. on some of the changes I saw phone was waiting ip from dhcp server but it goes till 150 sec and then reboot itself . If I connect PC to port of ERS I get IP at once from vlan 20 ip pool.. why this stupid phone can not ?? How should I change vlanid or another settings on the ipphone network settings if I have only voice vlan on that ERS 4500 and DHCP pool is on Cisco Catalyst working as router for different vlans ? if I turn off LLDP in the 46xxxxconfig.txt and the load to phone will it help?