The CRL with revoked server certificate needs to be loaded in the sip client. 
TLS server doesn’t send CRL to client during handshake.

Sent from my iPhone

> On Jul 3, 2018, at 6:16 AM, Daniel-Constantin Mierla <[email protected]> 
> wrote:
> 
> Hello,
> 
> haven't played with CRL lately, but kamailio should just call libssl 
> functions for validating the certificates, after initializing the context 
> with CRL file.
> 
> Maybe you can open an issue on github.com/kamailio/kamailio tracker, add 
> there all log messages printed by kamailio with debug=3 in kamailio.cfg. In 
> this way we do not forget about it and can be investigated properly.
> Cheers,
> Daniel
> 
>> On 28.06.18 08:47, Amarnath Kanchivanam       wrote:
>> Hi All,
>> 
>> I'm trying to configured kamailio as TLS server with below configuration 
>> (tls.cfg) and TLS server is started successfully.
>> 
>> [server:default]
>> method = TLSv1+
>> verify_certificate = yes
>> require_certificate = yes
>> private_key = ./sip/server.key
>> certificate = ./sip/server.crt
>> ca_list = ./bundle.crt
>> crl = ./sip_crl.pem
>> verify_depth = 9
>> 
>> [client:default]
>> verify_certificate = no
>> require_certificate = no
>> 
>> TLS connection works fine.
>> Later i have updated the sip_crl.pem with server certificate revoked details 
>> and performed tls.reload command to load the latest update. 
>> After this I expect any TLS client trying to establish TLS connection should 
>> fail, as the client and server certificates are signed by same authority and 
>> server certificate is revoked. But the clients are able to establish TLS 
>> connection without any errors.
>> 
>> I'm not getting any traces to confirm CRL validation has been performed 
>> before accepting the TLS connection. 
>> 
>> Any advice would be help to proceed with evaluating CRL functionality.
>> 
>> -Amar
>> 
>> 
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> 
> -- 
> Daniel-Constantin Mierla -- www.asipto.com
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