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1.2 Important Notice for Subscription and Installation
1.2.1 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
1.2.2 Firewall Requirements
If the VoIP network contains a firewall, you must configure the firewall to allow VoIP packets to pass through
certain ports of the ports listed below without being blocked by filtering. The ports for which you need to
configure the firewall may vary depending on the network conditions.
For more information, consult your network administrator.
[IP Packets to V-SIPGW16 Card]
Port TCP/UDP Default Port No.
SIP Client Port UDP 35060
STUN Client Port UDP 33478
NAT Voice (RTP) UDP Port UDP 16000 to N
DNS (Client) Port UDP 30053
[IP Packets from V-SIPGW16 Card]
Port
TCP/UDP Default Port No.
SIP Server Port UDP 5060
Registrar Server Port UDP 5060
STUN Server Port UDP 3478
Manual DNS Server Port UDP 53
Programming Manual for Virtual SIP Trunk Card 7
1.2.2 Firewall Requirements