Layer 4 Ports Used In H.323; Ip Packet Sizes - TANDBERG D13192 Technical Description

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
Gatekeeper Discovery (RAS)
Q.931 Call Setup
H.245
Video
Audio
Data/FECC

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
• G.728
• G.722
• G.722.1
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).
D13192 Rev. 02
Technical Description of
Port
1719
1720
Range 5555—5587
Range 2326—2837
Range 2326—2837
Range 2326—2837
– 160 bytes per packet
– 40 bytes per packet
– 160 bytes per packet
– 60 bytes per packet
TANDBERG Gateway
with software version G2
Type
UDP
TCP
TCP
UDP
UDP
UDP
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