When setting up ppp I decided to lett rp3-config do it for me and lett it autodetect my modem. It found it correctly, but it configured it at 115200 bps, since it is on a 16450 uart (no fifos) this results in a dropped bit left and right, resulting in a not working connection (it never gets past the ppp negotiation). Since their are quite a lot of systems with 16450 uarts, and also modems with uarts which can't handle 115200, I suggest making 57600 the default speed, this is fast enough for allmost all real life situations. Also see bug 16640 where this was first discussed.
This bug is a ancient, is rp3 still shipped with current RH, otherwise this bug should probably be closed. Also I don't have the setup to reproduce this anymore!
I just saw that rp3 is replaced by system-config-network, closing, hmm how do I close this?
Reopening to correctly close as wontfix