Log in to the System Manager interface with the Administration user role.
From the System Manager main menu, select Elements > Routing > SIP Entities.
On the SIP Entities page, click New.
On the SIP Entities Details page, do the following:
In the Name field, enter the name of the SIP Gateway or Session Border Controller.
This name must be unique and can have between 3 and 64 characters.
In the FQDN or IP Address field, enter the fully qualified domain name or IP address of the SIP Gateway or Session Border Controller configured in the signaling–group on Communication Manager.
In the Type field, click Gateway.
In the Notes field, specify additional notes about the SIP entity.
In the Location field, click the SIP entity location from the list of previously defined locations.
In the Time Zone field, click the default time zone to be used for the entity.
In the SIP Timer B / F (in seconds) field, keep the default value 4.
In the Minimum TLS Version field, keep the default value Use Global Setting.