Brother MFC-J995DW Online User's Manual page 279

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an External or Extension Telephone
Connect an External or Extension Telephone
You can connect a separate telephone to your machine as shown in the diagram below.
Connect the telephone line cord to the jack labeled EXT.
Before you connect an external telephone, remove the protective cap (3) from the EXT. jack on the machine.
3
1 Extension telephone
2 External telephone
3 Protective Cap
Related Information
• External and Extension Telephones
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External and Extension Telephones > Connect
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