Here is a complaint from a customer.
"When I transfer a call to any extension and I have another incoming the first caller can hear me talking and can't hear the person I origanlly transfed the call to."

Is this the conference bridges being used up?

It doesn't sound like they transferred the call correctly if they can still hear the person who transferred the call.
or you didn't explain the complaint well.

I've seen this on other FX sites as well.

Is this happening only on the recptionest phone ? are they using Impact attendant or just a telephone?

They are using SCS 24 button phones.

Is it 190? Seems that I had an install with 190 that had this problem and upgradeing fixed it.

It is 191