Conditions; Installation - NEC 124i Enhanced Installation Manual

Conditions

Programmable Function Keys: Do not program a trunk key with a VoIP trunk port.
If Gatekeeper is not used, F-Route or ARS must be used.
If Gatekeeper is used, the 124i Enhanced system cannot specify an IP address.
DTMF Relay: If you want to use DTMF tones on VoIP trunks, the calling party ' s system has to support User Input
(H.245), otherwise the tone will not be detected.
Example: DID/DISA trunks or voice mail
DTMF relay mode must enabled in Program 0153, Item 8 for the VoIP Unit.
F-Route codes do not work with Last Number Redial.
F-Route does not work with automatic redial.
SMDR prints out the Called Party Number as dialed number digits. If the dial treatment deletes the F-Route code, that
F-Route code will not appear on the SMDR report.
Program 0901 - Basic Trunk Port Setup (Part A), Item 3: CODEC Gain Type does not work for VoIP trunks. See Program
0154 instead.
Echo-Canceller (DSP): The echo canceller will eliminate an echo by subtracting the predicted value from receive-gain level. If
highway gain has been added, DSP could receive unpredictable gain level. If this happens, the echo cannot be eliminated. If the
gain was added by some system outside of the 124i Enhanced, an echo may occur. This is unavoidable.
It is recommended that the i-Series system with a VOIPU PCB not be placed behind a firewall. Firewalls restrict access to
TCP/UDP ports, some of which are utilized by the VOIPU.
To ensure adequate speech quality, it is recommended that QoS (Quality of Service) is implemented on any routers or switch-
ing hubs in the VoIP network. Refer to the router's manual for further information.
If the i-Series system with a VOIPU PCB is installed behind a router with NAT (Network Address Translation) enabled, it is
necessary to use H.323 masquerading. (The router must have H.323 Masquerading. The H.323 setup message contains the
local IP address in a Q.931 UUS Information element. This local IP address in the UUS IE must be modified from the router.
The router has to replace the local IP with the global IP. This feature is not available on all routers. Refer to your router's man-
ual for further information.) In case the registering at a Gatekeeper is not located in the local network, the router has to mas-
querade the RAS protocol as well. Note that the misconfigured router may cause one-way speech path connections.

Installation

A Switching Hub with Auto-Negotiation Feature or 100M Switching Hub is strongly recommended.
The VoIP PCB is Radvision compatible.
A Gatekeeper, if used, must be Radvision compatible.
Each installed VoIP PCB must be dedicated to a VoIP PCB at another site. Refer to "Hardware Considerations" on page 2.
1. Check the following LAN settings before installing the VoIP PCB:
Local IP Address
Subnet Mask
Default Gateway (If Router is used)
VoIP Unit does not support DHCP.
2. Define the VoIP PCB settings in Program 0319.
3. Attach a grounded wrist strap to your wrist and a grounded metal object (such as CEU ground).
4. Remove the cover from the common equipment cabinet by unscrewing the two front panel retaining screws.
Page 8
IP Network
Router
LAN
Gate Keeper
ISDN/Analog
VoIPU
Trunk
DSTU
Main Equipment
Key Telephones
Public Network