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Technical Description of TANDBERG Gateway with software version G2
D13192 Rev. 02 13
4.1.5.7 Layer 4 Ports used in H.323
The following tables describes which layer 4 ports are being used by the TANDBERG
Gateway when a call is made on an H.323 network.
TANDBERG Gateway meetings + Duo Video
Function Port Type
Gatekeeper Discovery (RAS) 1719 UDP
Q.931 Call Setup 1720 TCP
H.245 Range 5555—5587 TCP
Video Range 2326—2837 UDP
Audio Range 2326—2837 UDP
Data/FECC Range 2326—2837 UDP
4.1.5.8 IP packet sizes
Audio
The TANDBERG Gateway can receive up to 60 ms of audio in each packet. The
TANDBERG Gateway is sending 20 ms of audio in each packet, thus:
• G.711 – 160 bytes per packet
• G.728 – 40 bytes per packet
• G.722 – 160 bytes per packet
• G.722.1 – 60 bytes per packet
Video
The TANDBERG Gateway is sending maximum 1450 bytes of video per packet.
Note:
In addition, the system needs to add the following header information for each of the audio
and video packets above:
20 bytes IP-header, 8 bytes UDP-header and 12 bytes RTP-header (i.e. 40 bytes in total).