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![SOLVED] SIP-Trunk CompanyFlex Telekom does not work - Providers - FreePBX Community Forums](https://community.freepbx.org/uploads/default/original/3X/f/d/fdae15075026b6fdcf68fe28b6c0f396b5263a66.png "SOLVED] SIP-Trunk CompanyFlex Telekom does not work - Providers - FreePBX Community Forums")
SOLVED] SIP-Trunk CompanyFlex Telekom does not work - Providers - FreePBX Community Forums
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Howto:Deutsche Telekom Magenta Zuhause SIP Provider Compatibility Test - innovaphone-wiki
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Recommended SIP Configuration for Deutsche Telekom – Yeastar Support
