SNCF Gares & Connexions asks you not to call 3117 for commercial reasons.
3117 and 31177 by SMS are emergency and security numbers for emergency services to signal a situation presenting a danger or an anomaly in the station or the train (person unwell, abandoned object, etc.).
As soon as you call, you will be put into contact with an operator 24/7 in less than 25 seconds, across the entire national rail network. The operator takes the information, identifies the problem and directs the information to the relevant service who will take the appropriate emergency action if required.