IP phone can not register after switch reload

[tianwen.zhao]

Hello everyone,

    After our switch reload ,all of the ip phone can not dial, but the ip phone can get an ip address and tftp server.but they just can not register with the call manager...and I don't know why.

Here are my configuration:

!
ip dhcp pool Voice
network 172.28.0.0 255.255.0.0
default-router 172.28.15.254
option 150 ip 172.21.15.232 172.21.15.231
dns-server 10.64.0.101 10.176.0.101
!

SW254#sho ip dhcp binding
Bindings from all pools not associated with VRF:
IP address Client-ID/ Lease expiration Type
Hardware address/
User name
172.28.0.79 019c.57ad.b584.c4 Feb 12 2019 10:39 AM Automatic
172.28.0.80 01dc.cec1.d539.02 Feb 12 2019 10:44 AM Automatic
!
SW254#ping 172.21.15.231

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.21.15.231, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/11/17 ms

Thank you

[Dennis Mink]

From the cucm these phones should be registered on, can you ping the phone, actually do a traceroute from cucm and see where the tracert dies, and focus on the last good hop.

[tianwen.zhao]

thank you for your reply
I can ping ip phone ,but CUCM display ip phone status is unregistered,

[luis_cordova]

Hi @tianwen.zha,

Regardless of the registration, if the phone has IP, you should be able to ping from the CUCM.

This is to make it a connectivity problem.

If you have not already done so, you could turn the phone off and on.

Regards

[tianwen.zhao]

thank you for your reply
I can ping the CUCM from IP phone ,and I also reboot the IP Phone. The problem is the same

[Leo Laohoo]

Connect a PC into the same VLAN as the phones. Can the PC reach the CUCM webpage?

Have you cleared the ARP?

[tianwen.zhao]

Thank you for your reply
PC can reach the CUCM webpage
I also clear the arp

[HARIS_HUSSAIN]

1) Is there a firewall in between CUCM & Phone. If so please check if Port SCCP and SIP Ports are not blocked in firewall.

2) Also Make sure SIP/SCCP Inspection is disabled on the firewall.

Most probably it is due to the inspection.

3) Move one of the test phone to Same subnet as CUCM and try registering phone there. If it registeres fine then we can conclude the issue is on network side.

** Please dont forget to rate if found helpful.

Thanks,
haris

[tianwen.zhao]

Thank you for your reply
as far as I know , There is no firewall between CUCM & Ip phone .
CUCM is in the Headquarters, And here is the branch,so I can't move one of the IP phone to the same subnet as CUCM
Headquarters' ip phone is ok
IP phone had been ok all the time here. Since the switch and the voicegateway reloaded the IP phone is not work

[HARIS_HUSSAIN]

1) Have you check the configuration on Swith and Voice Gateway. Has it changed after reload. Compare it will old Backup Configurations.
2) One The Phone Go To Status and see what are the status message it is showing ?
3) Try to Install Cisco IP communicator in One of the PC and Put that PC In Voice Vlan and Try to register CIPC. You can try to check if TFTP and SIP/SCCP Port are open by using telnet command from PC and Also try capturing wireshark and see the traffic.

[tianwen.zhao]

Thank you for your reply
1.I compare with the old configuration , I found that Voice Gateway do not have IP phone's arp right now ,but the core switch does. I think the problem is in Voice Gateway .How can I check for it ? 

Old arp table in voice gateway
HPHQVG01# sho arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 172.28.0.8 132 9c57.adb5.8c2f ARPA GigabitEthernet0/0
Internet 172.28.0.12 187 9c57.adb5.8b1e ARPA GigabitEthernet0/0
Internet 172.28.0.13 240 dcce.c1d4.909e ARPA GigabitEthernet0/0
Internet 172.28.0.15 51 38ed.1855.026f ARPA GigabitEthernet0/0
Internet 172.28.0.16 220 9c57.adb5.8b7f ARPA GigabitEthernet0/0
Internet 172.28.0.17 8 dcce.c1d4.9105 ARPA GigabitEthernet0/0
Internet 172.28.0.18 39 3820.560d.16f5 ARPA GigabitEthernet0/0
Internet 172.28.0.20 93 9c57.adb4.37fb ARPA GigabitEthernet0/0
Internet 172.28.0.21 1 9c57.adb4.39a0 ARPA GigabitEthernet0/0
Internet 172.28.0.28 181 9c57.adb5.89c3 ARPA GigabitEthernet0/0
Internet 172.28.0.29 141 9c57.adb4.854d ARPA GigabitEthernet0/0
Internet 172.28.0.33 9 dcce.c1d4.9101 ARPA GigabitEthernet0/0
Internet 172.28.0.34 48 9c57.adb5.8c15 ARPA GigabitEthernet0/0

Now:
HPHQVG01# sho arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 172.28.15.253 - e4aa.5d11.6b50 ARPA GigabitEthernet0/0
Internet 172.28.15.254 32 0035.1a9c.0c41 ARPA GigabitEthernet0/0

 Voice Gateway how to learn ip phone 's arp ?

Thank you

[HARIS_HUSSAIN]

Voice Gateway need not to learn the arps for IP Phone.

How is you connectivity to CUCM . Is there a VPN between HQ and Branch?
How is traffice flow path from Phone To CUCM ? IPPHone----->Switch----->VOICE GATEWAY-----vpn-------ROUTER----CUCM ?

Thanks,
Haris

[tianwen.zhao]

Thank you for your reply
the traffice flow path from Phone To CUCM is
IPPHone-----Switch-----VOICE GATEWAY------ROUTER-------OSPF----------ROUTER----CUCM

[HARIS_HUSSAIN]

Can you try to put on Laptop in voice subnet and check the ports 2000.5060,5061 Tcp and try registering CIPC

[tianwen.zhao]

Thank you for your reply
I did some test
Now the ip Phone subnet is subnet A
It is strange that when I changed the IP phone 's subnet A to subnet B , they can register with the CUCM
but I can't see the difference between A and B. These two subnets both can communicate with CUCM
Subnet A 's IP pool is created by switch
Subnet B's IP pool is created by win server 2008, this ip pool do not have option 150 ,but it works
I don't fiugre out..