2 channels to 6 channels

AT&T is our WAN provider.  We want to increase 4 of our 27 remote
sites on the Frame Relay WAN from 128kps to 384.  So my boss tells the
AT&T sales guy, hey, we wanna upgrade these 4 sites, wanna speed up
their internet connectivity.

So tonight, the upgrades were scheduled for all 4 sites.  All 4 sites
have a Cisco 1603 router for the CPE.  Some may have an integrated
CSU/DSU, but i'm not sure (I just started working here about 3 weeks
ago and am new to WAN stuff).  I can telnet to each router just fine,
but I don't see anything that indicates port speed, line speed,
bandwidth, cir, pvc...nothing that looks like I can change it from 128
to 384.

The AT&T guy, sitting on the other end of the phone, says that he can
change the number of channels from 2 to 6 on HIS end, but that
somebody needs to change it from 2 to 6 on OUR end.  However, when I
set this up with the sales rep from AT&T and then the AT&T 'order
specialist', I asked if there was anything we needed to do to be
prepared for upgrading all 4 sites in one evening.  She said, no, the
tech guy could walk me through it.

Well, she was wrong, apparently.  So, I'm asking anyone who may be
able to shed some light into this darkness of mine:  what exactly do I
need to do to make this change happen?  Do I need to telnet into the
CSU?  How do you do that?  Apparently AT&T can't do it, 'cause they're
problems stop at the d-marc.  I talked to another Cisco engineer, and
he said, nope, nothing for me to do.  It's a fractal T-1,
point-to-point.  With a Cisco 1603 on the other end.  That's about all
I know.  What, if anything, do I change on the router?  If nothing,
how do I convince the AT&T guy of that?

Thanks for anyone who can enlighten me regarding the steps involved!

scsi