azaghul wrote: » Hi, An AIM-VOICE-30 installs in the AIM socket of 2600/3700 series routers, and provides DSP resources to E1/T1 cards installed in normal WIC slots. This allows you to run E1/T1 CAS or CCS without having to use up a network module. They will NOT support FXO/FXS cards. I have one installed in my HQ router (3725) and another in my PSTN router (2691) to simulate ISDN PRI connectivity. Do you need them? That would depend on you are trying to do. An AIM-CUE also installs in the AIM socket 2600/3700/2800 series routers, and provides voice mail services to CUCM or CUCM-E. However being a small flash based system the number of VM boxes and recording time is limited. Hope this helps