Panasonic 75/85/95 MXP User Manual

Appendices 

269 

 

 

 

 
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 signaling 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: 

ƒ  Dynamic: The ports are allocated at random from 2048 to 65535. 
ƒ  Dynamic H323 ports are allocated at random from 11000 to 65535. 
ƒ  Static: Will use the predefined layer 4 ports listed in the tables below.  

 

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