Cisco Cisco TelePresence Video Communication Server Expressway
Connecting VCS to Unified CM using TLS
These instructions explain how to take a system that is already configured and working using a TCP
interconnection between VCS and Unified CM, and to convert that connection to use TLS instead. This
process involves:
interconnection between VCS and Unified CM, and to convert that connection to use TLS instead. This
process involves:
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Ensuring certificate trust between Unified CM and VCS
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Setting the Cluster Security Mode of the Unified CM to 1 (Mixed Mode)
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Configuring a SIP trunk security profile on Unified CM
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Updating the Unified CM trunk to VCS to use TLS
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Updating the VCS neighbor zone to Unified CM to use TLS
Ensuring certificate trust between Unified CM and VCS
For Unified CM and VCS to establish a TLS connection with each other:
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VCS and Unified CM must both have valid server certificates loaded (you must replace the VCS's default
server certificate with a valid server certificate)
server certificate with a valid server certificate)
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Unified CM must trust VCS’s server certificate (the root CA of the VCS server certificate must be loaded
onto Unified CM)
onto Unified CM)
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VCS must trust Unified CM’s server certificate (the root CA of the Unified CM server certificate must be
loaded onto VCS)
loaded onto VCS)
for full details about loading certificates and how
to generate CSRs on VCS to acquire certificates from a Certificate Authority (CA).
Note that in a clustered environment, you must install CA and server certificates on each peer/node
individually.
individually.
We strongly recommend that you do not use self-signed certificates in a production environment.
Loading server and trust certificates on VCS
VCS server certificate
VCS has only one server certificate. By default, this is a certificate signed by a temporary certificate
authority. We recommend that it is replaced by a certificate generated by a trusted certificate authority.
authority. We recommend that it is replaced by a certificate generated by a trusted certificate authority.
To upload a server certificate:
1. Go to
Maintenance > Security certificates > Server certificate
.
2. Use the Browse button to select and upload the server certificate PEM file.
3. If you used an external system to generate the certificate request you must also upload the server private
key PEM file that was used to encrypt the server certificate. (The private key file will have been
automatically generated and stored earlier if the VCS was used to produce the signing request for this
server certificate.)
automatically generated and stored earlier if the VCS was used to produce the signing request for this
server certificate.)
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The server private key must not be password protected.
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You cannot upload a server private key if a certificate signing request is in progress.
4. Click Upload server certificate data.
Unified CM with Cisco VCS (SIP Trunk) Deployment Guide (X8.1)
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Connecting VCS to Unified CM using TLS