CISCO IP PHONES ARE NT REGISTERING WHEN CONNECTED TO CISCO SWITCHES 3850

[Tosin Ola]

Pls, guys, I have a challenge which is giving me concern. Our company plan to change some switches which are End Of Life(switch 2560, 3560 and 3750 series) with new cisco switch 3850 series, I configured these new switches using the same config file on the existing switches, after configuration, I deployed the new switches, I noticed the cisco IP PHONES are not registering when I connected them to the new switches 3850 series but they are working perfectly on the existing switches. Pls, help me out on this issue.

[Leo Laohoo]

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@Tosin Ola wrote:
The phone is not getting any valid IP address

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Ok, now we're getting somewhere. 

Next step:  Is the phone in the correct (voice) VLAN? 

[Tosin Ola]

YES. Phone is in voice vlan 60

[Tosin Ola · Accepted solution]

Thanks everyone for your assistance. The phones are working fine now. I created Vlans on the switch which were on the network and with that it work fine.