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AMA-CUCM Troubleshooting: Best Practices for Reading Trace Files

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Beginner

IP phones not working

I have 3 cisco 8841 IP phones, These phones are showing unregistered in cucm.

 

I have verified these phones are coming up in switch and configured under voice vlan.

 

I can see three phones are receiving ip address, DHCP server is releasing the ip address . What could be the problem in this case.

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Accepted Solutions
VIP Advisor

Re: IP phones not working

Troubleshoot IP Phone registration :

 

https://community.cisco.com/t5/collaboration-voice-and-video/troubleshooting-ip-phone-registration/ba-p/3103422

 

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12 REPLIES 12
VIP Advisor

Re: IP phones not working

At this stage we can only think of how these Phones contacting CUCM server to register?

Do you have DHCP Options  ? or how is your registration process ?

 

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Beginner

Re: IP phones not working

DHCP option is enabled and these phones are receiving different ip address when compared with other phones

VIP Advisor

Re: IP phones not working

Then check on the Switch VLAN Settings for that Access port where the Phones connected.

 

 

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Beginner

Re: IP phones not working

I just fixed one phone, by giving the IP address manually 

Re: IP phones not working

You need to check your DHCP settings as well as to verify if the Voice Vlan is distributed through the trunk on the switch that your phones are connected.

 

George

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VIP Advisor

Re: IP phones not working

Glad it was working, suggest to check switch side helper address (if you have multiple DHCPservers in the network) and VLAN the Phone belong to.

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Beginner

Re: IP phones not working

I have verified dhcp server information and the phones are receiving IP address from correct dhcp server.

 

Please let me know how to troubleshoot further if phone is receiving IP address. 

VIP Advisor

Re: IP phones not working

What is the IP working Manually configured and tested. what is DHCP IP address you getting

can you post switch configuration to look.

 

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Beginner

Re: IP phones not working

IP Address which I manually enter is 172.27.192.51

Earlier it is receiving IP 172.27.192.15

 

DHCP pool  information 

network 172.27.192.0 255.255.255.192

 

 

interface cofnig

interface GigabitEthernet1/0/11

Switchport access vlan 10

switchport mode access

switchport voice vlan 30

no logging event link-status

srr-queue bandwidth share 10 10 60 20

queue-set 2

Priority-queue out

mls qos trust device cisco-phone

mls qos trust cos

spanning-tree portfast edge

spanning-tree portfast edge

service-policy input AutoQos-Police-CiscoPhone

End

 

 

VIP Advisor

Re: IP phones not working

IP Address which I manually enter is 172.27.192.51    <-- is this working ?

Earlier it is receiving IP 172.27.192.15   <-- if so this should also work because same range,

 

Do you have any FW or access rules ?

 

 

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Beginner

Re: IP phones not working

172.27.192.51 yes it is working, that's what I was wondering.

 

is there any way to get a logs from CUCM

VIP Advisor

Re: IP phones not working

Troubleshoot IP Phone registration :

 

https://community.cisco.com/t5/collaboration-voice-and-video/troubleshooting-ip-phone-registration/ba-p/3103422

 

BB
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