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Introduction

How to set up

To make interconnection with Bayern operator, follow the steps below:

1. Upload the following CA certificates to the PBX, to the /etc/ssl/certs:
   

   1. bayern-softtoken-issuing-ca-2019_base64.cer 
   2. bayern-root-ca-2019_base64.cer

2. Execute the below CLI command to add these certificates to the system:

   
   

   Code Block
   update-ca-certificates

   
   

3. From the operator, get the certificate file (e.g. ssl_something.bayern.de.p12) and upload it to the PBX

4. On the PBX, make .key and .pem files from the .p12:

   Code Block
   openssl pkcs12 -in ./ssl_something.bayern.de.p12 -out /etc/kamailio/ssl/ssl_something.bayern.de.key -nocerts -nodes openssl pkcs12 -in ./ssl_something.bayern.de.p12 -out /etc/kamailio/ssl/ssl_something.bayern.de.pem -clcerts -nokeys

   
   

5. Copy the current tls config file for SIP proxy:

   Code Block
   cp /etc/kamailio/tls.cfg /etc/kamailio/tls_custom.cfg

   
   

6. At the end of the file /etc/kamailio/tls_custom.cfg add the following block:

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