Adding DHCP Option 43 for IP Phones in Switch(es)

thet naing 

Hello and thanks for your guidance. Actually I have done the same and given the comand lines to the "Network engineers" who manage our Cisco routers (DHCP server for the subnetwork) and it seems that the config command line with the full sub-options is too long because, our IP Phones are getting a truncated value of the CertProvisioning URL string, therefore never get the to find the service. The engineer argues that in principle the whole line has been accepted by the Cisco config but the reality shows that the parameter is incomplete. Is there a limiting parameter for the cisco config line number of characters?

Thanks for any idea

Alfredo