We have an EU who uses a 5610 for conference calls. It would appear to be simplex working, eg if I am on a call to them and they put the call on speaker I cannot hear them if I talk when they are talking, or even if I breathe a little heavily!
Colpot
(Remember - If it aint broke - fix it till it is.)
Colpot
(Remember - If it aint broke - fix it till it is.)