Strange port behavior on 2960G switch with CiscoPhone

[LukaszPrasal8770]

Hi to all,
Can someone please help me with finding logic in this behavior:
Few days ago one of my colegaue reported that his phone went to ip registering, no changes were made on the port settings before. There are two Etherchanels on the switch with trunk on them but only one of them is active and have two memebers in it Gi49 and Gi50
I can see the mac address of the phone in Arp, I can se that his in voice vlan but those request doesn't reach our server.
Now the fun part :
When I disable one memeber of the active etherchannel, the phone can register and packets comes in and out  on the phone port, when enabled the phone port only send but didn not recieve anything. Phone port is Gi2

[Leo Laohoo]

And what firmware is the 2960G running on?

[balaji.bandi]

sure it is strange, what device otehr side connected ?  how is this links connected ? Ethernet or Fibre ? what is the uptime of the device ?

if you get chance post show version, if possible choose other port and move the Faulty link and test ?

[LukaszPrasal8770]

Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 15.0(2)SE8, RELEASE SOFTWARE (fc1)
To be honest all ports are set the same
I have there like 17 other phones that work ok
This is the port config
interface GigabitEthernet1/0/2
switchport access vlan 99
switchport mode access
switchport voice vlan 110
switchport port-security maximum 10
switchport port-security violation restrict
switchport port-security aging time 2
switchport port-security aging type inactivity
switchport port-security
ip arp inspection limit rate 100
authentication control-direction in
authentication event fail retry 0 action authorize vlan 39
authentication event no-response action authorize vlan 39
authentication host-mode multi-host
authentication port-control auto
macro description cisco-phone
dot1x pae authenticator
dot1x timeout tx-period 5
spanning-tree portfast
spanning-tree bpduguard enable
ip verify source

and these are my phones
Gi1/0/1 auto on 6.3 IP Phone 7940 n/a 30.0
Gi1/0/2 auto on 12.0 IP Phone 7975 3 30.0
Gi1/0/3 auto off 0.0 n/a n/a 30.0
Gi1/0/4 auto off 0.0 n/a n/a 30.0
Gi1/0/5 auto off 0.0 n/a n/a 30.0
Gi1/0/6 auto on 12.0 IP Phone 7965 3 30.0
Gi1/0/7 auto off 0.0 n/a n/a 30.0
Gi1/0/8 auto off 0.0 n/a n/a 30.0
Gi1/0/9 auto off 0.0 n/a n/a 30.0
Gi1/0/10 auto off 0.0 n/a n/a 30.0
Gi1/0/11 auto off 0.0 n/a n/a 30.0
Gi1/0/12 auto off 0.0 n/a n/a 30.0
Gi1/0/13 auto on 12.0 IP Phone 7975 3 30.0
Gi1/0/14 auto off 0.0 n/a n/a 30.0
Gi1/0/15 auto off 0.0 n/a n/a 30.0
Gi1/0/16 auto off 0.0 n/a n/a 30.0
Gi1/0/17 auto on 6.3 IP Phone 7942 2 30.0
Gi1/0/18 auto off 0.0 n/a n/a 30.0
Gi1/0/19 auto on 12.0 IP Phone 7975 3 30.0
Gi1/0/20 auto off 0.0 n/a n/a 30.0
Gi1/0/21 auto off 0.0 n/a n/a 30.0
Gi1/0/22 auto on 5.0 IP Phone 7911 2 30.0
Gi1/0/23 auto on 6.3 IP Phone 7942 2 30.0
Gi1/0/24 auto off 0.0 n/a n/a 30.0
Gi1/0/25 auto on 12.0 IP Phone 7965 3 30.0
Gi1/0/26 auto off 0.0 n/a n/a 30.0
Gi1/0/27 auto on 6.3 IP Phone 7942 2 30.0
Gi1/0/28 auto off 0.0 n/a n/a 30.0
Gi1/0/29 auto off 0.0 n/a n/a 30.0
Gi1/0/30 auto off 0.0 n/a n/a 30.0
Gi1/0/31 auto off 0.0 n/a n/a 30.0
Gi1/0/32 auto on 5.0 IP Phone 7911 2 30.0
Gi1/0/33 auto off 0.0 n/a n/a 30.0
Gi1/0/34 auto off 0.0 n/a n/a 30.0
Gi1/0/35 auto on 6.3 IP Phone 7940 n/a 30.0
Gi1/0/36 auto off 0.0 n/a n/a 30.0
Gi1/0/37 auto off 0.0 n/a n/a 30.0
Gi1/0/38 auto on 5.0 IP Phone 7911 2 30.0
Gi1/0/39 auto off 0.0 n/a n/a 30.0
Gi1/0/40 auto off 0.0 n/a n/a 30.0
Gi1/0/41 auto off 0.0 n/a n/a 30.0
Gi1/0/42 auto on 6.3 IP Phone 7940 n/a 30.0
Gi1/0/43 auto off 0.0 n/a n/a 30.0
Gi1/0/44 auto on 6.3 IP Phone 7940 n/a 30.0
Gi1/0/45 auto on 6.3 IP Phone 7941 2 30.0
Gi1/0/46 auto off 0.0 n/a n/a 30.0
Gi1/0/47 auto on 5.0 IP Phone 7911 2 30.0
Gi1/0/48 auto on 6.3 IP Phone 7940 n/a 30.0

And only number two have issue despite when connected to other switch the phone register just fine

[Georg Pauwen]

Hello,

if only one port/phone are affected, the first thing I would do is a factory reset of the Cisco IP Phone. Which model is the phone ?

Below the reset procedure for the 7940 / 7960 IP phone:

https://www.ifixit.com/Guide/How+to+reset+Cisco+7940+-+7960+IP+phone+to+factory+defaults/45374

[LukaszPrasal8770]

No this is not the phone issue but communication issue. We have made factory reset  on two phones and neither first one nor brand new one obtained ip despite both of them registered just fine in other switch. There is this strange relation betwenn disabling port 49 from ether channel and succesfull registration. Why? IDK