Client Certificates; Obtaining A Server Certificate - Cisco 521SG - Unified IP Phone VoIP Administration Manual

Provisioning
Using HTTPS
STEP 1
STEP 2
STEP 3
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide

Client Certificates

In addition to a direct attack on the Cisco IP phone, an attacker might attempt to
contact a provisioning server using a standard web browser, or other HTTPS
client, to obtain the Cisco IP phone configuration profile from the provisioning
server. To prevent this kind of attack, each Cisco IP phone also carries a unique
client certificate, also signed by Cisco, including identifying information about
each individual endpoint. A certificate authority root certificate capable of
authenticating the device client certificate is given to each service provider. This
authentication path allows the provisioning server to reject unauthorized requests
for configuration profiles.

Obtaining a Server Certificate

To obtain a server certificate:
Contact a Cisco support person who will work with you on the certificate process.
If you are not working with a specific support person, you can email your request
to ciscosb-certadmin@cisco.com.)
Generate a private key that will be used in a CSR (Certificate Signing Request).
This key is private and you do not need to provide this key to Cisco support. Use
open source "openssl" to generate the key. For example:
openssl genrsa -out <file.key> 1024
Generate CSR a that contains fields that identify your organization, and location.
For example:
openssl req -new -key <file.key> -out <file.csr>
You must have the following information:
• Subject field—Enter the Common Name (CN) that must be a FQDN (Fully
Qualified Domain Name) syntax. During SSL authentication handshake, the
SPA 9000 verifies that the certificate it receives is from the machine that
presented it.
• Server's hostname—For example, provserv.domain.com.
• Email address—Enter an email address so that customer support can
contact you if needed. This email address is visible in the CSR.
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