They would have to appoint your cert as a CA(certificate authority) for you to be able to use it to issue client certificates.  The best option is to use your own CA and just install your CA cert onto the devices (as you would already be installing client certs on devices this shouldn't be too hard).

~Mitch

On Sat, Jan 3, 2015 at 4:18 PM, Rajil Saraswat <rajil.s@gmail.com> wrote:
Hello,

I would like to use a commercial certificate to generate client
certificates for my TLS sip clients. I have received the following
files for my server from PositiveSSL

Root CA Certificate - AddTrustExternalCARoot.crt
Intermediate CA Certificate - COMODORSAAddTrustCA.crt
Intermediate CA Certificate - COMODORSADomainValidationSecureServerCA.crt
Your PositiveSSL Certificate - myserver_dyndns_org.crt


I did the following to create the files in freeswitch/conf/ssl

a) cat myserver.key myserver_dyndns_org.crt>agent.pem
b) cat COMODORSADomainValidationSecureServerCA.crt
COMODORSAAddTrustCA.crt AddTrustExternalCARoot.crt > cafile.pem


Testing the server works:
openssl s_client -showcerts -connect myserver.dyndns.org:5061

*****SNIP****
Server certificate
subject=/OU=Domain Control Validated/OU=PositiveSSL/CN=myserver.dyndns.org
issuer=/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA
Limited/CN=COMODO RSA Domain Validation Secure Server CA
---
No client certificate CA names sent
---
SSL handshake has read 6108 bytes and written 442 bytes
---
New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES256-SHA
Server public key is 2048 bit
Secure Renegotiation IS supported
*****SNIP******

How do i create the certificates for the clients now?

Thanks
Rajil

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