We chose the least expensive method we could find. We got a USR MPi-16 =
which uses 8 BRI ports and divides the channels to offer 16 lines for =
EITHER X2-56k or ISDN access. You plug them in via DB25 to a portmaster =
and you are off. The down side of this is that you can't differentiate =
between X2 callers and 28k callers.=20
Be sure to get a clear provisioning for the lines and we chose analog =
hunting (vs. digital) because we expect more traffic from X2.