Each Trunk Group can have a Media Port Range configured that indicates a range of values to use when allocating UDP ports. To provision a UDP media port range slightly larger than the actual count of ports ostensibly required to support the maximum simultaneous calls (not applicable to TCP media). The system reserves two UDP ports for each incoming UDP media call leg: one for (S)RTP and one for (S)RTCP. Thus, a configured port range must contain at least twice as many port numbers as the maximum simultaneous calls to be supported for that IPTG (not applicable to TCP media).

To View and Edit Media Port Range

On SBC main screen, go to All > Zone > SIP Trunk Group > Media > Media Port Range.

Select the desired Address Context, Zone and SIP Trunk Group from the drop-down list to view its respective Media Port Range parameters.

SIP Trunk Group - Media Port Range

The following fields are displayed:

SIP Trunk Group - Media Port Range parameters

Parameter Description
Base UDP Port

Indicates the start of the range of UDP ports to use for media. This value must be within the system-wide media port range. The value ranges from 1024-65534 and the default value is 1024.

If the value is set to none, then it indicates that this particular control is not applied and the port range specified by the system wide Media Port Range settings are used.

Max UDP Port

Indicates the end of the range of UDP ports to use for media. This value must be greater than the Base Udp Port and within the system-wide media port range. The value ranges from 1024-65534 and the default value is 65148. 

If the value is set to none, then it indicates that this particular control is not applied and the port range specified by the system wide Media Port Range settings are used.

Make the required changes and click Save at the right hand bottom of the panel to save the changes made.

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