asterisk users - Apr 2005 - can't use 2 port gws simultaneosuly

Hello,
               I have a strange problem . I am using Asterisk  CVS and
when I wnat to use two port SIP gateways like CISCO ATA , Linksys or
Sipura I can only use one port the other port does not register . I
can only use one of the ports.

               Can anybody help?

Ehsanul Karim