IP phone can not register

[tianwen.zhao]

Hello everyone

Our CUCM is in headquarter, and our branch have voicegateway.

here is the problem :
after the branch 's voicegateway reload, all of the barnch 's ip phone can not register

and the voicegateway haven't learn ip phone 's arp

but the communication between ip phone and CUCM is ok ,and voicegateway also can ping CUCM

I would appreciate everyone who replied

Thanks

[@Syed]

Do you see TFTP IP address on those phones?

[@Syed]

Do you see TFTP IP address on those phones?

[Shalid Kurunnan Chalil · Accepted solution]

Hi ,

I am trying to get the relation between VGW and phones in a normal situation other than UCM down scenario.  If the connectivity with UCM and IP phone is fine, then there shouldn't be any problem. 

• check the DHCP option 150 have the correct TFTP ip address configured
• check the basic network details on the phone 
  • Does the phone got IP address
  • does it shows the TFTP IP address
• what is the VGW registration status on Call manager?

Regards,

Shalid 

[tianwen.zhao]

Thank you for your reply
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..