A method for interacting of a Public Service Answering Point, PSAP, with a portable network device, comprising: - S101, S102 Establishing a call between the portable network device and the PSAP; - S103 Detecting, by the PSAP, a trigger signal of an eyewitness-button from the portable network device; - S105 Storing call log data of the call by the PSAP; - S106 Setting up by the PSAP a signaling connection between the portable network device and the PSAP; - Determining, in the PSAP, a geographical area of interest (501', 501") around the portable network device; - Determining, by the PSAP, a list of external portable network devices comprising at least one external portable network device located within the geographical area of interest (501', 501") - S107, S108 Scanning, by the portable network device, the at least one external portable network device of the list, wherein scanning the at least one external portable network device of the list comprises using a short-range wireless connection technology; - Protecting, by the PSAP, the signaling connection from unauthorized access for forwarding data of an external portable network device, wherein protecting comprises at least one protection mechanism selected from the list of protection mechanisms, consisting of: - Providing a token by the PSAP; - Switching the portable network device in a transparent relay mode; - Employing an encryption mechanism; - Disabling scanning and/or forwarding of data by a signaling message; - Disabling scanning and/or forwarding of data automatically; and/or - Unlocking the protection mechanism by using an authentication certification mechanism; - Forwarding the scanning result from the at least one external portable network device of the list via the signaling connection to the PSAP. - S101, S102 Establishing a call between the portable network device and the PSAP; - S103 Detecting, by the PSAP, a trigger signal of an eyewitness-button from the portable network device; - S105 Storing call log data of the call by the PSAP; - S106 Setting up by the PSAP a signaling connection between the portable network device and the PSAP; - Determining, in the PSAP, a geographical area of interest (501', 501") around the portable network device; - Determining, by the PSAP, a list of external portable network devices comprising at least one external portable network device located within the geographical area of interest (501', 501") - S107, S108 Scanning, by the portable network device, the at least one external portable network device of the list, wherein scanning the at least one external portable network device of the list comprises using a short-range wireless connection technology; - Protecting, by the PSAP, the signaling connection from unauthorized access for forwarding data of an external portable network device, wherein protecting comprises at least one protection mechanism selected from the list of protection mechanisms, consisting of: - Providing a token by the PSAP; - Switching the portable network device in a transparent relay mode; - Employing an encryption mechanism; - Disabling scanning and/or forwarding of data by a signaling message; - Disabling scanning and/or forwarding of data automatically; and/or - Unlocking the protection mechanism by using an authentication certification mechanism; - Providing a token by the PSAP; - Switching the portable network device in a transparent relay mode; - Employing an encryption mechanism; - Disabling scanning and/or forwarding of data by a signaling message; - Disabling scanning and/or forwarding of data automatically; and/or - Unlocking the protection mechanism by using an authentication certification mechanism; - Forwarding the scanning result from the at least one external portable network device of the list via the signaling connection to the PSAP.