IMac can't connect to internet dial up after start up.

I've a problem every time I try to make a connection to the internet directly after starting up my iMac. The very first time I try to log on to my ISP the Mac appears to make a connection, the status window in Internet connect indicates that it has (generally 52-54000bps), but when I try to surf, my browser can't find any sites, same with email. I get the standard connection noise when dialing out, occasionally the noise drops out mid way through, but it always makes a connection. Sometimes it will disconnect after about 30-40 secs, sometimes it doesn't. When I reconnect a second time I get good speeds and can stay on for hours. This is happening every time I boot up and dial out, basically I now expect to have to dial out twice before I can get onto the web every time I switch on the computer.
I've read a few threads re this problem, it seems the iMac has a software modem which can cause some problems, but there doesn't seem to be too many complaints about this exact same issue. Should I be getting a Mac tech to sort this out or is this a generic issue that may be resolved in a future software update? This is a new Mac – my second as the first nearly flew out the window after a kernel panic. Apple tech support in Sydney don't seem to have heard of this problem, and have told me to re install the OS again, which of course I have, plus run disk aid and re set the permissions etc etc...
The ISP has given me an alternative dial up number which actually works the first time I dial in, but I only get speeds of 28000bps. Can anyone shed any light on this? Will I get a similar problem if I went to Broadband?
Thanks for any comments...

Unfortunately I've not got any help on this issue. An Apple tech has told me to try changing the modem settings down to V34 which I did, the connection worked correctly but I was only getting speeds of up to 33000bps, real speed tests showed I was actually only on 28000bps, same as when I dialed the alternative number given by the ISP, not good enough. I don't have any other devices connected to the phone line, in fact the line is only used for the internet. Maybe there is a problem with this type of software modem, but then why isn't there more comments here, unless everyone else is on broadband. Apple and my ISP seem to think the slower connection is more reliable, it is but at a cost. Not sure why this is considered better when the speed is so slowww. Like Seb above I don't have any problems when I'm using a Windows lap top on the same line.
Anyone out there know the answer??? There are at least 3 of us with this problem...

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