Cisco IP Phone Issue

[blanders@hufsd.edu]

On occasion a Cisco IP phone would disconnect and re-register. It would take anywhere from a minute to a few minutes. Sometimes physical disconnecting or reconnecting is required. 

Phones: 7841 or 7861

CM - 11.5.1

Firmware on Phones - sip 12-5-1sr1-4

Logs on 2960 Stack when issue occured

050255: Sep 28 08:29:59.365 EDT: %SWITCH_QOS_TB-5-TRUST_DEVICE_LOST: cisco-phone no longer detected on port Gi1/0/31, operational port trust state is now untrusted.
050260: Sep 28 08:39:26.906 EDT: %SWITCH_QOS_TB-5-TRUST_DEVICE_DETECTED: cisco-phone detected on port Gi1/0/31, port's configured trust state is now operational.

Switch port configuration

switchport access vlan 2
switchport mode access
switchport voice vlan 221
srr-queue bandwidth share 1 30 35 5
priority-queue out
no snmp trap link-status
mls qos trust device cisco-phone
mls qos trust cos
spanning-tree portfast edge
spanning-tree bpduguard enable

Any help or suggestions would be greatly appreciated. 

[Leo Laohoo]

1. What is the exact firmware version of the switch?
2. Post the complete output to the command "sh interface Gi1/0/31 controller". 

[blanders@hufsd.edu]

1.  15.2(7)E4

2. The port phone has since been moved to another port but here is the info

GigabitEthernet1/0/31 is down, line protocol is down (notconnect)
Hardware is Gigabit Ethernet, address is e0d1.7312.891f (bia e0d1.7312.891f)
Description: INSTRUCT
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto-speed, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 17:41:16, output 17:39:54, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1193020
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
4546398 packets input, 1038758053 bytes, 0 no buffer
Received 113170 broadcasts (113039 multicasts)
0 runts, 0 giants, 0 throttles
3 input errors, 1 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 113039 multicast, 0 pause input
0 input packets with dribble condition detected
41783758 packets output, 6317533455 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out

Transmit GigabitEthernet1/0/31 Receive
2022568003 Bytes 1038758053 Bytes
8647216 Unicast frames 4433228 Unicast frames
12209751 Multicast frames 113039 Multicast frames
20926807 Broadcast frames 131 Broadcast frames
0 Too old frames 992488484 Unicast bytes
0 Deferred frames 28734284 Multicast bytes
0 MTU exceeded frames 10586 Broadcast bytes
0 1 collision frames 0 Alignment errors
0 2 collision frames 1 FCS errors
0 3 collision frames 0 Oversize frames
0 4 collision frames 0 Undersize frames
0 5 collision frames 0 Collision fragments
0 6 collision frames
0 7 collision frames 52540 Minimum size frames
0 8 collision frames 121768 65 to 127 byte frames
0 9 collision frames 4249869 128 to 255 byte frames
0 10 collision frames 58287 256 to 511 byte frames
0 11 collision frames 2883 512 to 1023 byte frames
0 12 collision frames 60260 1024 to 1518 byte frames
0 13 collision frames 0 Overrun frames
0 14 collision frames 0 Pause frames
0 15 collision frames
0 Excessive collisions 2 Symbol error frames
0 Late collisions 0 Invalid frames, too large
0 VLAN discard frames 794 Valid frames, too large
0 Excess defer frames 0 Invalid frames, too small
18488372 64 byte frames 0 Valid frames, too small
13803310 127 byte frames
6908441 255 byte frames 0 Too old frames
727899 511 byte frames 0 Valid oversize frames
536612 1023 byte frames 0 System FCS error frames
1317753 1518 byte frames 0 RxPortFifoFull drop frame
1387 Too large frames
0 Good (1 coll) frames
0 Good (>1 coll) frames