Issue 2.0
SV9100 Networking Manual 8-23
SECTION 13 SYSTEM IP PHONES AND ANALOG TRUNKS
Due to the nature of analog-to-digital conversion, considerable echo may be
encountered when using Analog Trunks with IP Phones.
Due to all Analog trunks being different, padding of the Analog Trunks in PRG 81-07
and 14-01 may be necessary. Even after the pad changes are made, echo may still
be present the first few seconds of the call while the echo cancellers are learning the
characteristics of the circuit on this call.
Program 90-68-01 can be used to automatically test the lines and auto assign the
proper values in Program 81-07. It is recommended to use this program whenever
analog trunks are involved.
It is recommended to use digital trunks when using IP phones for best performance.
Digital (ISDN, T-1, and SIP) trunks do not suffer from this problem.
SECTION 14 FIRMWARE UPGRADE PROCEDURE
A new version of NEC firmware for the IP Phones can be applied automatically or
manually.
The upgrade requires using an FTP/TFTP server. This is a software package that
runs on a PC. (These can be downloaded from the Internet, usually as freeware or
shareware.)
14.1 Manually Upgrading Firmware
Manually upgrading the firmware uses an FTP/TFTP server, but requires the
engineer visit each IP Phone individually. This may take longer, but is more
controlled as the downloads can be staggered to avoid excessive bandwidth
utilization.
To manually upgrade the firmware:
1. Install and configure an FTP/TFTP server.
2. Copy the firmware file itlisip(e,s,v).tgz to the default FTP/TFTP directory.
3. To enter Programming Mode, press the Help button on the IP Phone.
4. To enter Maintenance Mode, press 0 (Config) and #3 (Maintenance).
5. To access the Download menu, press 1.
6. Enter the FTP/TFTP server IP address in Option 2 - Download Address.
7. To enter the protocol, press #3 (Protocol FTP or TFTP).
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