ppp and bonding help

I am trying to set up bonding using two null modem connections and PPP.
I have gotten bonding to work with Ethernet but having trouble with
ppp over null modem because it appears that ppp cannot carry a
connection with out an IP address.( I hope I am incorrect) If ppp0 and
ppp1 have an assigned IP address my bond0 doesn't seem to work.
After an ifenslave bond0 ppp0 ppp1 the bond0 interface is present and
it appears to be working but I can not ping something on the network.
This is the same way with my Ethernet but if I don't specify an ip
address for each interface except for bond0 it works well. I am using
Debian Linux 2.4 kernel. The ppp command I use to make the ppp
connection is pppd -detach crtscts lock 192.168.0.1:192.168.0.2
/dev/ttyS4 57600 & If I don't specife and IP address it connects and
then hangs up, the same with if I use then noipdefault option So is
there anyway to get ppp and bonding working? How can I get ppp to stay
connected with out an IP address? Thanks