Using conference services through Skype

I don't know whether I've just been unlucky, but I've not had much success trying to get into conference services or indeed other services that require me to use the keypad after I've dialed in, using Skype, either through a computer interface or the new DUALphone.

Sometimes I just simply can't get in, other times I can enter my pin number, but then additional settings (muting for listen only, for example) just fails to be acknowledged.

Of course, the ideal would be to run the entire conference on Skype, but while were in the transition mode from landline to Skype, it's these issues that can become annoying.