the extender 1000 uses a dial up line and the extender 3000 uses an ISDN line. speed requirements go up from there. I just bid out to a customer for exxtending their ACD out to other cities using the gateway and extenders, you can select voice channel speed down to 16K per channel. We would have gone ISDN for 4 phones but the LD cost was a dealkiller.
If voting could really change things, it would be illegal.
JerryReeve
Communications Systems Int'l
com-sys.com