SIP Settings

Before you start creating extensions for SIP phones or SIP trunks, you should review options configured for SIP devices.

To configure common options used for all SIP devices (phones and trunks), perform the following steps:

  1. Open the UCx Web-based Configuration Utility
  2. From the PBX tab, select PBX Configuration
  3. From the left side column, select SIP Settings
  4. Review the configured defaults
  5. If you made any changes in the settings for SIP phones, press the Submit Changes button to save the configuration

You should review and change the default values for some of the options as required: 

NAT Settings

Update the NAT specific configuration options to match your network configuration.

Click on Auto Configure to let the system detect and automatically populate the values for External IP and Local Networks.
Click on Add Local Network Field to add more fields for multiple networks.


Audio Codecs


Video Codecs


Media & RTP Settings


Notification & MWI


Registration Settings


Jitter Buffer Settings

If you have SIP external devices (phones or trunks) that are not located on your local subnet, you should set the Jitter Buffer option to Enabled.


Advanced General Settings

If you want to change the default port number (5060) that is used by the UCx system for communication with SIP phones (for example for security reasons), enter the desired port number in the Bind Port field.

For interoperability with recent releases of Nortel/Avaya CS1000 and BCM50 switches, the Legacy User Option Parsing must be set to Yes.

It is highly recommended that you leave the fields Allow SIP Guests and Allow Anonymous Inbound SIP Calls at the default values of No for security reasons.

You can override some of the default settings configured on this page with device specific settings configured on the SIP extension or SIP trunk configuration page of each SIP device.

Self Assessment Quiz

  1. Do you know what happens if you click on the Auto Configure button under NAT Settings?
  2. Do you know when to enable Jitter Buffer?
  3. What is the default port number for SIP devices?
  4. Do you understand the security risks of setting Allow Anonymous Inbound SIP Calls to Yes?