Chapter
Downloading IFM Firmware
The Interface Module (IFM) is the telephony interface for analog MultiVOIP units. There is one IFM for each channel of the MultiVOIP unit. For each channel, the IFM handles the analog signals to and from the attached telephone, PBX or CO line.
The IFM communicates with the main processor to indicate the status of the telephone line. For example, it might indicate that a phone is off hook (FXS) or that an incoming ring is present (FXO).
The IFM receives operating instructions from the VOIP’s main processor. For example, the IFM might be instructed to ring the phone (FXS) or seize the line (FXO). The IFM contains a codec (coder/decoder) to convert the incoming audio to a PCM stream (pulse code modulation) which it sends to the DSP (digital signal processor). The IFM’s codec also converts outgoing PCM to audio.
The firmware of the IFMs can change over time. As such, you may need to upgrade the firmware. To upgrade firmware:
1.In the System Information window of the MultiVOIP Configuration software, check the version number of the IFM firmware already installed on the MultiVOIP unit. Write down the version number.
2.Exit the Configuration software program. The MultiVOIP Configuration program must be off when invoking the Download IFM Firmware command. If it is on, the command does not work.
3.To use the Download IFM Firmware command, go to Start Programs MultiVOIP x.xx Download IFM Firmware.
4.A dialog box opens. Click OK.
5.The “Boot” LED on the front panel of the MultiVOIP comes on.
6.The software searches for an IFM firmware file to use to upgrade the system. If the file found represents firmware newer than that already installed on the MultiVOIP (or if you want to overwrite the same version of firmware) click Open.
128 | MultiVOIP® Voice/Fax over IP Gateways |
