We hae seperate Data and voice network. For data network we have interface vlan 1 ip address 10.91.192.0/24 in one core switch 4506. For voice network we have interface vlan 1 172.20.1.0/24.
Now i am going to merge data and voice network. But vlan 1 on these core switches are different as mentioned above. i can add another network in core switch for voice traffic, but the voice management vlan is vlan 1 (172.20.1.0/24) in voice core switch and the CCM and TFTP server for the ip phone image load and boot and Gateway router are lies in this vlan due to this i am not able to ping 172.20.1.0 from my data network.