Panasonic KX-NS300, Installation Manual

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8.3.2 SIP Requirements
Port Requirements
Required Ports for Each Channel
When configuring a router with NAT enabled, you need to secure a certain number of ports for each SIP and
RTP/RTCP channel. For RTP/RTCP, the number of required ports is double the number of activated SIP trunks
(Ch). For SIP signalling, the number of required ports is always one regardless of the number of activated SIP
trunks (Ch).
<Example>
If 4 SIP trunk channels are activated, you need the following number of ports:
Protocol Type Required Port
RTP 4
RTCP 4
SIP 1
Total 9
Firewall Requirements
If the VoIP network contains a firewall, the firewall must be configured appropriately to allow VoIP packets to
pass through the network without being blocked by filtering. For the protocols and port numbers that the PBX
uses for VoIP communication, refer to "8.5 Port Security".
The ports for which you need to configure the firewall may vary depending on the network conditions.
For more information, consult your network administrator.
8.3.3 Router Requirements
•
Port Forwarding:
It may be necessary to set the NAT router so that it forwards the incoming packets to the IP address of the
V-SIPGW4 card if all of the following conditions are met:
–
the PBX uses a STUN server;
–
a V-SIPGW4 card is located under a NAT router;
–
incoming packets are routed to a SIP Client port or NAT Voice (RTP) UDP port indicated in "8.5 Port
Security".
•
SIP-NAT Feature:
When a V-SIPGW4 card is located under a NAT router that supports the SIP-NAT feature
*1
, it is
recommended to disable this feature.
*1 When NAT is enabled, the router translates the IP address stored in the IP header and the port number stored in the UDP header.
When SIP-NAT is enabled, the router also translates the IP address and port number stored in SIP messages.
8.3.4 Bandwidth Requirements
When using the V-SIPGW4 card, 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.
Installation Manual 287
8.3.4 Bandwidth Requirements