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I have an answer, but it depends on how the Siemens box works. A quick Google search implied that it might be a digital device, which means that this suggested solution would NOT work. I did set up something similar to this for a client in the states, whose door intercom system was basically set up to make an analog phone in their apartment (that was ...


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Usually SIP providers allows you to forward only to extension/username on the same domain. So probably you can't forward to other domains. (You can't set a full SIP URI as the forward destination, only the username part)


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If the capture have not started before the VoIP session then wireshark will not detect it. Workaround: select the "Try to decode RTP outside of conversations" (from Preferences -> Protocols -> RTP)


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VPN is not the best solution for VoIP, because: requires third party VPN client or VPN client settings by the end-user DPI firewalls can easily block it (for example by just checking for the VoIP nature of the streams. e.g. same continuous upload and download) A general VPN is not VoIP aware (jitter, packet loss and delays are not considered) Subpar ...



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