Aastra OpenCom 510 User Manual page 60

OpenPhone 71/73/75: Extensions and accessories for system telephones
The headset must comply with DIN Norm EN 60950-1 Point 6.2 ("Safety of infor-
mation technology equipment including electrical business equipment").
Connecting a headset to a system telephone
The connector for the headset is in the bottom of the system telephone's casing
and is indicated by this symbol
1. Plug the RJ45 jack on the headset cable into the socket provided.
2. Pass the cable through the recesses provided on the underside of the system
telephone.
3. Activate the headset on the system telephone in the menu Phone settings:
Headset (see also the system telephone's user guide).
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Headset