•
Each trunk port can be set to a SIP carrier or an analog line.
•
Both of the WAN ports (WAN1 and WAN2) can be used for either SIP carrier connections (private
network) or IP network connections (public network).
•
To identify which LAN/WAN port is being used for each SIP carrier when both WAN1 and WAN2
are enabled, the routing information to each SIP Carrier must be retained.
•
To use two WAN ports, one of the ports must be selected as the default route. For more
information, refer to in 3.4 Network Configuration—[5] Route in Programming Item List.
3.4.2 Connecting Analog Trunks
Connection
1.
Insert the modular plugs of the telephone line cords (2-conductor wiring) into the outside (CO) line jacks.
2.
Connect the line cords to the terminal board or the modular jacks from the telephone company.
Note
•
Each trunk port can be set to a SIP carrier or an analog line.
•
The end of calls is detected by tone. The detection target is as follows (In cases of Analog
trunk
⇔
extension, the detection of call endings is not performed);
Analog Trunk
⇔
Analog Trunk
Analog Trunk
⇔
SIP Trunk
Analog Trunk
⇔
VM
Analog Trunk
⇔
DISA
3.4.3 Bandwidth Requirements
When using the SIP trunks and the remote extensions, you must ensure that the WAN has enough
bandwidth to support VoIP communications. Refer to the table below and ensure that the sum of the
required bandwidth for each channel is smaller than the amount the WAN (e.g., ADSL network) can provide.
Note that the amount in the table is only a guide. Subscribe to a network that has enough bandwidth. If the
amount of bandwidth required for VoIP communications is larger than what the network can accommodate,
speech quality will be compromised.
Required Bandwidth for Each Channel
The required bandwidth depends on what combination of codecs is used. Keep in mind the following points
about the type of codec, in terms of the speech quality:
Codec
Bandwidth
G.711
87.2 kbps
G.729
31.2 kbps
H.264 (Remote Video)
512 kbps
Required Bandwidth
= [No. of SIP Trunk (G.711) × Required Bandwidth for the G.711 codec] +
[No. Remote SIP Extension (G.729) × Required Bandwidth for the G.729 codec] +
[No. Remote SIP Extension (Remote Video) × Required Bandwidth for the H.264 codec]
3.4.2 Connecting Analog Trunks
Getting Started
69
