Most people here are going to go into length to try to help you out, but we’re not magicians. You would need to provide a little bit of more information than what you have done up to this point.
To start with describe your setup and your system landscape, then provide your current configuration and the output from debug ccsip message. With this we’d have a sporting chance to give you some help along the way.
First thing need to check your outbound css in your sip trunk configuration that means which partition you are dialling that should be contain on your sip trunk outbound CSS configuration and on your end device line CSS.
Pls rate if its “Helpful”. If this answered your question pls click “Accept as Solution”.