No longer can connect to conference calls?!

in iPhone edited October 2015

 After this latest IOS update, I can longer connect to a conference call. The initial number dials in  correctly (ie. 1-800-xxx-xxxx),  then when asked for the conference number ... what ever my iPhone is transmitting is no longer being picked up (the tones aren't being detected).  It all works correctly from my land line(s) ... what could have changed in the ios update that would break this?   It worked fine last week!! 

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