Hi folks, is there anyone here who wants to share experience with Cisco's 3640 and callback over a PRI ISDN? We are having troubles and probably going to give up and switch to other solutions, but not before consulting with the people on this list (Cisco TAC already consulted..) We have a 3640 with 3 banks of digital MICA modems and want to terminate both analog and ISDN calls over a PRI ISDN on the Cisco. The Cisco should callback over the PRI to *both* analog and ISDN users. All of the 30 available B channels should be dedicated to this purpose. That's all, is that possible? We are using IOS 12.1.1(T), MICA Portware 2.6.2.0, E1/PRI ISDN ctrl, client modems USRobotics, Multitech, Supra etc. So far callback works, with a TACACS+ based AAA scheme, but we have the following problems: - a high rate a unsuccessfull incoming calls (~50%) with the modems idle and a busy signal or no answer at all (debug on Cisco shows a generic ISDN disconnect error) - during the callback the modems do not handhshake properly, even disabling V.90 and K56Flex (S29=1) so the Cisco drops the carrier after a (long) timeout - we need to reload the Cisco every second day in order to get a reasonable % of successfull incoming calls (and test, and test...) "clear modem all" doesn't do any good. - the ISDN line is clean, "show cont", "show int ser 1/0:15" show no errors at all. We use the "framing no-crc4" command on the controller, otherwise it goes down with "alarm detected", does this matter? - Cisco TAC say our configuration is correct, why then it doesn't work? They are investigating..so am I. Anyone with similar experiences? BTW, we do have the "modem country mica netherlands" and "modem autoconfigure type mica" in the config... Thanks indeed in advance. --------------- Eugenio Pierno RIPE NCC Amsterdam - The Netherlands