asterisk users - Sep 2003 - Netopia SDSL modem w/ IAX2 calls...

Has anybody experienced problems with a DSL modem stopping all other traffic 
when an IAX channel opens up?  I've really traced this thing out as best I
can
- it isn't a lack of bandwidth on the DSL connection (I've had three 
concurrent Ulaw calls coming in at once with no problems), nor a problem 
within the network (other intranetwork traffic isn't affected by the call) -
the SDSL modem just stops sending/recieving all other trraffic when I get a 
call via IAX - this includes web traffic, UDP packets for the for VPN, ftp, 
etc...  SDSL modem is a Netopia R7100-C.  Anyone ever seen or heard of 
anything like this??? Thanks for your patience with me, I'm doing a ton of 
googling and testing but I can't seem to get any answers...




thanks,




dave redmore