Cisco IP ICD supports up to 48 agents in as many as 48 groups. IP ICD simultaneously supports 48 calls in progress and 48 calls in queue.
If we interpret this in agent and cti ports we see that we need to have 48 cti ports and 48 agents.To have 48 ports with Call Manager 3.1 you will need to have a dedicated server for your IVR. ThisIVR will come with 5 IP IVR ports - so to have 48 you will have to perchase 43 ports. The Cisco IP IVR will be priced on a per-port basis and will be offered in three packages:
http://www.cisco.com/warp/public/cc/pd/unco/ipivr/prodlit/ipivr_ds.htm
A co-resident software add-on for an installed Cisco CallManager (CM) server: This co-resident Cisco IP IVR software-only option will be limited to a total of ten ports, ten IVR ports, ten AA ports, or any combination as long as it doesn't exceed the ten port limit. The software-only optionincludes five IVR ports. The part number to order the co-resident software-only option is"sw-ivr-2.2-mcs=". The co-resident software-only package will work with any of the current installed Cisco MCS-78xx CM servers or Cisco approved customer provided servers. It only works with CM v3.1.