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 . <EOS>