User`s manual

MediaPack SIP User’s Manual 5. Configuring the MediaPack
Version 4.6 121 June 2005
5.6.1.5 Configuring the RTP Settings
¾ To configure the RTP Settings parameters, take these 4 steps:
1. Open the ‘RTP Settings’ screen (Advanced Configuration menu > Network Settings >
RTP Settings option); the ‘RTP Settings’ screen is displayed.
Figure 5-32: RTP Settings Screen
2. Configure the RTP Settings according to Table
5-32.
3. Click the Submit button to save your changes.
4. To save the changes so they are available after a power fail, refer to Section
5.9 on page
161.
Table 5-32: Network Settings, RTP Settings Parameters
Parameter Description
RTP Base UDP Port
[BaseUDPPort]
Lower boundary of UDP port used for RTP, RTCP (Real-Time Control Protocol)
(RTP port + 1) and T.38 (RTP port + 2). The upper boundary is the Base UDP Port +
10 * (number of gateway’s channels).
The range of possible UDP ports is 4000 to 64000.
The default base UDP port is 6000.
For example:
If the Base UDP Port is set to 6000 (the default) then:
The first channel uses the following ports: RTP 6000, RTCP 6001 and T.38 6002,
the second channel uses: RTP 6010, RTCP 6011 and T.38 6012, etc.
Note: If RTP Base UDP Port is not a factor of 10, the following message is
generated: ‘invalid local RTP port’.
For detailed information on the default RTP/RTCP/T.38 port allocation, refer to the
Section
C.3 on page 270.
RTP IP Diff Serv
[IPDiffServ]
Diff Serv Code Point (DSCP) value that is assigned to the RTP packets. The DSCP
value is used by DiffServ compatible routers to prioritize how packets are sent. By
prioritizing packets, the DiffServ routers can minimize the transmission delays for
time sensitive packets such as VoIP packets.
The valid range is 0 to 63. The default value is 0.
Note: The parameter IPDiffServ mustn’t be used simultaneously with the parameters
IPTOS and IPPrecedence.
RTP IP TOS
[IPTOS]
Value that is assigned to IP Type Of Service (TOS) field in the IP header for all RTP
packets sent by the VoIP gateway.
The valid range is 0 to 15. The default value is 0.
Note: The parameters IPTOS and IPPrecedence mustn’t be used simultaneously
with the parameter IPDiffServ.