| Product ID | Product Description |
| NIM-2FXO | 2-port Network Interface Module - FXO (Universal) |
| NIM-4FXO | 4-port Network Interface Module - FXO (Universal) |
| NIM-2FXS | 2-Port Network Interface Module - FXS, FXS-E and DID |
| NIM-4FXS | 4-Port Network Interface Module - FXS, FXS-E and DID |
| NIM-2FXS/4FXO | 2-Port FXS/FXS-E/DID and 4-Port FXO Network Interface Module |
| NIM-2FXSP | 2-Port Network Interface Module - FXS, FXS-E and DID |
| NIM-4FXSP | 4-Port Network Interface Module - FXS, FXS-E and DID |
| NIM-2FXS/4FXOP | 2-Port FXS/FXS-E/DID and 4-Port FXO Network Interface Module |
| NIM-4E/M | 4-Port E/M Network Interface Module |
| NIM-2BRI-NT/TE | 2-Port BRI Network Interface Module |
| NIM-4BRI-NT/TE | 4-Port BRI Network Interface Module |
Since the fourth-generation Cisco NIMs have their own DSP to
support voice, there is no need to synchronize the clock to the
backplane, and the clock-participate command is not supported in
the BRI, FXO/FXS, and E/M NIMs. The NIMs support:
●Caller line ID
●G.711, G.729a, and G.726
●G723 and Internet Speech Audio Codec (iSAC); Internet Low Bit Rate
Codec (iLBC) is on the roadmap
●Fax detection, pass-through, and relay (T.38)
●Modem detection and pass-through
●Dual-tone multifrequency (DTMF) detection
●Echo cancellation
●Voice activity detection
●Comfort noise generation
●Real-Time Control Protocol (RTCP)
●Acoustic shock protection
●Noise reduction is on the roadmap
●Real-Time Transport Protocol (RTP)
●RFC 4733 Digit Relay
The FXS features include:
●Capable of supporting either FXS or DID functionality
●Configurable long loop ports
●Message waiting indicator (MWI)
●Cable detection
The FXO features include:
●Supports both ground start and loop start modes
●Provides call detail record (CDR) information
●Support for interworking with Cisco Unified Communications Manager
(Skinny Client Control Protocol [SCCP]), H.323, Session Initiation
Protocol (SIP) and Media Gateway Control Protocol (MGCP) 1.0
●Cable detection
●Overload protection
