How to use the 3rd analog phone port of 7050?

[zooster]

The 3rd analog phoen port of the 7050 is not normal, it has just 2 holes. How to connect there a phone??

 

[KuniGunther]

See, e.g., http://en.wikipedia.org/wiki/TAE. You have to connect the lines a and b of the phone.

Volker