TANDBERG D13192 manual Function Port Type, Audio, Video

Technical Description of TANDBERG Gateway with software version G2

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).

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