ring back probleme with obi110

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ZOUAVE:
Hello,

i have a strange probleme, 2/3 off the time, i don't ear the ring back tone when i call the person, just a silence and after the person answers, the conversation is normal, the qualite is very good.

I don't understand what setting can change for hear ring tone.

thank you

ZOUAVE

PS:I have freephoneline

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