I
IAM Initial Address Message
I-CSCF Interrogator - Call Session Call Function (IMS)
IBCF Interconnection Boarder Control Function (IMS)
IETF Internet Engineering Task Force
IMPI IP Multimedia Private Identity
IP Multimedia Public Identity (Also see WIMPU)
IPDV IP Packet Delay Variation
IMS IP Multimedia Subsystem
IMS Irritable Male Syndrome
IRS Implicit Register Set
ISAC Internet Speech Audio Codec
ISDN Integrated Services Digital Network
ISUP Integrated Services User Part
ITS Interruptions To Service (OFCOM)
ITU-T International Telecommunications Union - Telecommunications
