Sip login telekom.de

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Hello, is there a workaround to register the mikopbx at tel.t-online.de ?

based on this information it does not work
https://www.telekom.de/hilfe/werksreset-speedport/werksreset-faq/einrichtung-sip-client?samChecked=true

phonenumber@t-online.de there seem to be problems for the busername

1and1 it went without problems

Thanks in advance

MfG Marcel

Hello, In the Username field, you need to enter your SIP ID (phone number). If the authentication name is different from the SIP ID, you can specify it in the Advanced Options field, for example like this:

[registration-auth]
username=phonenumber@t-online.de

[endpoint-auth]
username=phonenumber@t-online.de