Cisco 7960/7970 phones are having issue registering on CUCM with Cat 3750X POE

[Gopala Krishna Chaikam]

Hi, 

I have no issue for the configuration of same phones (7970, 7960) on Cat 3850, but on 3750 

Below configuration works for 3850: 

3850_1#show run int g1/0/37

Building configuration...

Current configuration : 183 bytes

!

interface GigabitEthernet1/0/37

switchport trunk encapsulation dot1q

 switchport mode trunk

 switchport voice vlan 2501

 switchport trunk native vlan 2501

 spanning-tree portfast

end

But the same configuration doesn't work for 3750X (mentioned below):

3750X_1#show run int g1/0/37

Building configuration...

Current configuration : 183 bytes

!

interface GigabitEthernet1/0/37

switchport trunk encapsulation dot1q

 switchport mode trunk

 switchport voice vlan 2501

 switchport trunk native vlan 2501

 spanning-tree portfast

end

So, I tried the below configuration as per the configuration guide from 3750X for voice VLAN config after enabling mls qos in global configuration mode, but not working either. What might I have missed ? 

3750X_1#show run int g1/0/37

Building configuration...

Current configuration : 183 bytes

!

interface GigabitEthernet1/0/37

 switchport mode access

 switchport voice vlan 2501

 switchport voice detect cisco-phone full-duplex

 mls qos trust cos

 spanning-tree portfast

end

3750X_1#show power inline g1/0/37
Interface Admin  Oper       Power   Device              Class Max
                            (Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/37  auto   on         10.3    IP Phone 7970       3     30.0

Interface  AdminPowerMax   AdminConsumption
             (Watts)           (Watts)
---------- --------------- --------------------

Gi1/0/37              30.0                 30.0

Thanks,

Gopal. 

[islam.kamal]

Hello

1- Is the Ip phone able to get Ip address?.

2- can you enable under interface "cdp enable and cdp run" + on global configuration of switch "cdp run , cdp advertist-v2"?.

3-Can you share the below output?.

SW2#sh mls qos maps | be Cos-dscp

4- The below configuration for same switch model and work very well.

interface x/x

switchport mode access

switchport access vlan 101

switchport voice vlan 102

spanning-tree portfast

mls qos trust cos 0

mls qos trust device cisco-phone

Thanks

please rate all useful information

[Gopala Krishna Chaikam]

Hi, 

Tried the mentioned ones. But didn't work. 

Uploaded the required output. But this command "mls qos trust cos 0" is not allowed on 3750x switch.