Initiate 3xx Response to Endpoint

Owned by Kelli Higdon
Last updated: Apr 02, 2024
4 min read

 

 

When receiving an INVITE request, the IMG 2020 can be configured so when an INVITE request is received the IMG 2020 will respond to the remote gateway on the incoming side with either a 301 Moved Permanently or 302 Moved Temporarily response. This 3xx response will include the IP address of a second gateway to redirect the initial INVITE request to. The feature is configured through the SIP Profile and is set up using the Web GUI. The configuration is described below.

Diagram

As displayed in the Network and Call Flow diagrams below, the IMG 2020 0 receives an INVITE from a remote SIP gateway on the incoming leg. If the Initiate 3xx Response to Endpoint feature is configured, the IMG 2020 0 will respond to the Signaling Gateway on the incoming side with either a 301 Moved Permanently or 302 Moved Temporarily response. This response will include the IP address of another endpoint to redirect the call to. The IP address information is sent in the contact header of the 3xx response message.

Call Flow Diagram 

Call Trace

 Call Trace - Initiate 3xx

Configuration

Initial Configuration

The procedure below explains how to configure the IMG 2020 to respond to a SIP gateway on the incoming side with a 301 or 302 redirect response. Before configuring, the IMG 2020 must have an initial configuration created on it. Follow the Basic Configurations procedure before proceeding.

Create a SIP Profile (SGP) and SIP Headers page

Configure the SIP Profile then the SIP 3XX object. Once these are configured, they can be linked to a SIP External Gateway.

  • Right click on the Profiles object and select New SIP Profiles. The SIP Profiles object is a parent or container object. No configuration is needed here. Refer to the SIP Profiles topic for more information on this object.

  • Right click on the SIP Profiles object and select New SIP Profile. The first profile that gets created is a Default SIP Profile and cannot be modified. Disregard this profile.

  • Right click on the SIP Profiles object and select New SIP Profile again. In the SIP Profile object that appears, either enter a name that identifies this SIP Profile or accept the default name already entered. In this example the SIP Profile was labeled SIP_3xxRedirect_Profile. Refer to the SIP Profile - SGP topic for information on configuring the remaining fields in this object.

  • Right click on the SIP Profile object just created and select New SIP 3XX. The SIP 3XX object will get created. Initially the Initiate 3XX Response field will be set to Disable. To enable, select Enable from the drop down menu. Refer to screen capture below.

  • Once Enable is selected, a second field labeled 3XX Response will open up. Initially this field is set to Disable. Select from drop down menu either 301 (Moved Permanently) or 302 (Moved Temporarily). This is the response that will be sent back to the originating gateway. Refer to screen capture below.

  • Once the Response is selected from the drop down menu, a third field labeled the Contact Header IP Address field will open up. In this field, enter the IP address of the SIP Entity that you would like to redirect the call to. Refer to the screen capture below.

Refer to the SIP 3XX topic for more information on this object.

Create a Remote Gateway

An external network element must be created. Configure an external remote gateway that the SIP channel group will send messages to.

  • Right click on the Dialogic object and select New External Network Elements. The External Network Elements object is a parent or container object and no configuration is needed here. Refer to External Network Elements topic for more information.

  • Right click on External Network Elements and select New External Gateways. The External Gateways object is a parent or container object also and no configuration is needed here. Refer to External Gateways for more information.

  • Right click on External Gateways and select New External Gateway. Enter a name that identifies the gateway being configured. In this example the gateway was labeled SIP_3XX_Red_GW.

 

  • Select SIP from drop down menu in the Gateway Signaling Protocol field.

  • Enter an IP address for this gateway.

  • Select the SIP Profile (SGP) created earlier from drop down menu in the SIP Profile field. 

Configure SIP Signaling

The configuration above displays how to configure the SIP Profile and External SIP Gateway so that the Initiate 3xx Response to Endpoint functionality is configured. The next step is to configure the SIP signaling stack and SIP Channel Groups. Refer to the Configure SIP (Single SIP IP) topic for a procedure on how to configure the SIP functionality. 

Additional Information

  • The 3xx Initiate Response to Endpointfeature is implemented on incoming SIP call only.

  • By default, the feature is disabled.

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