Strange Behaviour in forwarded calls

can you help me find out what is happening in this scenario?
I have an incoming call from an analog line, 3CX is getting it from a Yeastar TE-100, the call arrives to an IP-Phone Yealink T41P and everything is fine (voice on both ends).
If the Yealink T41P forwards the call to another extension, wich is configured on another Yealink T41P, the phone rings, but when the call is picked up there is no voice on both ends.
All the phones are in the same network.
Might there be some misconfiguration somewhere?
Kindest Regards

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