Thomson 780WL->'abgehend anruf fehlgeschlagen'

Hi VoIP dudes,

On the 780WL (FW x.x.16.x), when I call with VoIP to other number, I can hear the others, but they can not hear me. Used standard web interface to add all VoIP details.

I have had this problem before, but for some reason, it worked eventually. I would like to know, what could cause the called party, not to hear the calling party. Phone is ok and tested.

Thanks mucho danke for any tips....

Tried code ...no result.
Trying a couple of things. I get back 2 ya with the results.