TANDBERG 700 MXP 931, Ping, Traceroute, Layer 4 Ports used in H.323 calls, Function Port Type

Glossary

6.14 Appendix 14

Diagnostic Tools for IP

To use these tools, will require using a PC and setting up a telnet session towards the system.

Q.931

To show Q.931 trace during a call you need to issue the command ‘syslog on’.One can get traces for RAS, Q.931 and H.245 with this command. It is a complex trace and requires an extensive knowledge in H.323 signalling to be understood.

Ping

Ping is used to see if the system is able to reach a specific IP-address, using a mechanism in IP called ICMP. If the system is unable to register to its gatekeeper, or if it is unable to dial a specific endpoint, one can use ping to see if there is at least an IP-route to the gatekeeper or to the endpoint. In case you have problems, one would first ping the default gateway, then the gatekeeper, and then the other endpoint.

Traceroute

Traceroute does exactly that; it traces the route an IP-packet takes to reach its destination and displays all router hops. Traceroute is very useful for seeing exactly where there is a routing- problem in the IP-network, and for checking where transport-delay is introduced.

Layer 4 Ports used in H.323 calls

The layer 4 ports used by the system in a H.323 call can be defined as follows:

ƒDynamic: The ports are allocated at random from 2048 to 65535.

ƒStatic: Will use the predefined layer 4 ports listed in the tables below.

Function	Port	Type
Gatekeeper Discovery (RAS)	1719	UDP
Q.931 Call Setup	1720	TCP
H.245	Range 5555-5574	TCP
Video	Range 2326-2341	UDP
Audio	Range 2326-2341	UDP
Data/FECC	Range 2326-2341	UDP
Point-to-point + Duo Video

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