We are using 7206 routers to interconnect pbx's at different facilities over atm. The version of IOS we are using is 12.3 (3.3) MAINTENENCE INTERIM SOFTWARE. For obvious reasons we would like to get off this release of IOS. Every time we upgrade to a different version of IOS we run into issues. These issues vary from release to release. Some won't establish trunks at all, some just inject noise into the voice circuit. Does anyone have a version of IOS the are using for this that works?
