They probably use this blocklist, as do many websites, especially banks and email providers.

https://mxtoolbox.com/problem/blacklist/dan-tor

This means they don't have to monitor internet traffic themselves.



Am 16.02.26 um 23:10 schrieb Marek Küthe via tor-relays:
So that means Deutsche Telekom monitors Internet traffic (or at least
the Tor directory, which contains all the nodes) and detects when a Tor
node is being operated. And if that is the case, TCP access to the SIP
servers is blocked? Or have I misunderstood something here?

On Sat, 14 Feb 2026 13:50:55 -0000
iji--- via tor-relays <tor-relays@lists.torproject.org> wrote:

Hi
a big German provider "Deutsche Telekom" has started blocking access (at TCP layer) to their SIP servers in February 2026.
That means running a middle tor on this provider line results in a non-functional provider SIP service.
You have to choose between running a middle tor or a working provider SIP service.
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