AudioCodes Mediant 800B User Manual page 321

User's Manual
Parameter
ipv6if
[CpMediaRealm_IPv6IF]
Port Range Start
port-range-start
[CpMediaRealm_PortRangeStart]
Number of Media Session Legs
session-leg
[CpMediaRealm_MediaSessionLeg]
Port Range End
port-range-end
[CpMediaRealm_PortRangeEnd]
Version 7.2
By default, no value is defined.
To configure IP network interfaces, see Configuring IP
Network Interfaces on page 135.
Defines the starting port for the range of media interface UDP
ports.
By default, no value is defined.
Note:

You must either configure all your Media Realms with port
ranges or all without; not some with and some without.

The available UDP port range is according to the
BaseUDPport parameter. For more information, see
'Configuring RTP Base UDP Port' on page 199.

The base UDP port number (BaseUDPPort parameter)
must be greater than the highest UDP port configured for a
SIP Interface (see 'Configuring SIP Interfaces' on page
336). For example, if your highest configured UDP port for
a SIP Interface is 6060, you must configure the
BaseUDPPort parameter to any value greater than 6060.

The port must be different from ports configured for SIP
traffic (i.e., ports configured for SIP Interfaces). For
example, if the RTP port range is 6000 to 6999, the SIP
port can be less than 6000 or greater than 6999.
Defines the number of media sessions for the configured port
range.
By default, no value is defined.
(Read-only field) Displays the ending port for the range of
media interface UDP ports. The device automatically
populates the parameter with a value, calculated by the
summation of the 'Port Range Start' parameter and 'Number of
Media Session Legs' parameter (multiplied by the port chunk
size) minus 1:
start port + (sessions * port spacing) - 1
For example, a port starting at 6,000, 5 sessions and 10 port
spacing:
6,000 + (5 * 10) - 1 = 6,000 + (50) - 1 =
6,000 + 49 = 6,049
The device allocates the UDP ports for RTP, RTCP and T.38
traffic per leg in "jumps" (spacing) of 10. For example, if the
port range starts at 6000 and the UDP port spacing is 10, the
available ports include 6000, 6010, 6020, 6030, and so on
(depending on number of media sessions).
For RTCP and T.38 traffic, the port offset from the RTP port
used for the voice session is one and two, respectively. For
example, if the voice session uses RTP port 6000, the RTCP
port and T.38 port for the session is 6001 and 6002,
respectively. However, you can configure the device to use the
same port for RTP and T.38 packets, by configuring the
T38UseRTPPort parameter to 1.
For more information on local UDP port range, see
321
17. Control Network
Description
Mediant 800B Gateway & E-SBC