I'm currently experiencing some odd behaviours when using these functions and I need some help debugging to find the root of the issue.

I receive a call from a client and do some changes to the To and From header using auto mode with password. Encrypted info goes on the Record-Route header parameters (vsf\vst) normally.

1 - On subsequent requests sent by the originating client, domains on To and From header are different from the ones sent in the first INVITE. In this scenario, somehow the automatic modifying has errors on the end result. Can the different domains affect the end result of the automatic modifying or only the vsf\vst parameters and password are needed to the auto replace\restore? 

2 - How can I decrypt the info on vsf and vst parameters in order to verify the info sent and the encryption?

Cheers,

Duarte Rocha