[Issue Description]
With Telekom CompanyFlex Sip Trunk often gets unregistered, or can't get registered.
[Solution]
1. Please check the exact DNS address offered by Telekom and configure it on PBX’s network settings page. 8.8.8.8 Or any other DNS address would no work.
If the sip provider's DNS doesn't work, please try to use the below DNS.
2. Please set the Registration Timer as below.
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