SIP Delayed Media Outbound

The 2020 IMG supports both inbound and outbound delayed media. For information on inbound delayed media see SIP Delayed Media Inbound - 3PCC. SIP Delayed Media Outbound gives the 2020 IMG the ability to generate an outbound delayed media SIP call where the INVITE message generated does not contain an offer SDP. Negotiation will proceed once offer SDP is received from a far end provisional response or in final response. The 2020 IMG will either pass, release, or cancel the call. Below are the three scenarios supported.

Scenario 1


Scenario 2


Scenario 3


Configuration Procedure

The procedure below explains how to configure the 2020 IMG for outbound delayed media. Before configuring the outbound delayed media feature, the 2020 IMG must have an initial configuration created on it. Follow the Basic Configurations procedure before proceeding onto configuring the 2020 IMG for delayed media.

Create an Signaling Gateway Profile (SGP) for Delayed Media Feature

  1. Right Click on the Profiles object and select New SIP SGP. In the SGP object enter a name in the SIP Profile Name field to identify this object. Since a profile other than the default SGP Profile will be used, modify the SIP Profile ID to something other than ID:0 to allow other fields in this object to be modified. Enable the Outbound Delayed Media by selecting Enabled from drop down menu of the Outbound Delayed Media field. For more information on the SIP SGP pane see SIP SGP.


  2. Right Click on 2020 IMG Name and select New Signaling. The Signaling Object is created to allow multiple signaling objects below it. No configuration needs to be accomplished in this object. See Signaling for information on this object

  3. Right Click on Signaling Object just created and select New SIP. Select the SIP Gateway Profile just created from drop down menu in the Remote IMG’s SIP Profile. See screen capture below. See SIP Signaling for more information on this object.


Create SIP Channel Groups

  1. Right Click on 2020 IMG EMS and select New Routing Configuration. See Routing Configuration for more information.

  2. Right Click on Routing Configuration and select New Channel Groups. This is a container object and no configuration is needed. Below the Channel Groups object, the Channel Group object can be created. Refer to Channel Groups topic for more information.

  3. Right Click on Channel Groups object and select New Channel Group. Enter a name to identify this channel group and change the Signaling Type to SIP using the drop down menu. Refer to SIP Channel Group for more information on configuring a SIP channel group.

Create an External Network Element

The SIP Channel group needs to communicate withe an external SIP entity. Create an external network element and then an external gateway that the SIP channel group will transmit messages to.

  1. Right Click on 2020 IMG EMS and select New External Network Elements. The External Network Elements object is a container object and no configuration is needed in this object. Refer to External Network Elements for more information.

  2. Right Click on External Network Elements object and select New External Gateways. The External Gateways object is also a container object. Under the External Gateways object, multiple individual gateways can be created under it. Refer to External Gateways for more information.

  3. Right Click on External Gateways object and select New External Gateway. Enter a name in the Name field to identify the gateway being created. Select SIP from drop down menu in the Gateway Signaling Type field. Refer to External Gateway for more information.


Insert SIP External Network Element into SIP Channel Group

  1. Right Click on the SIP Channel group created and select New IP Network Element. Within the IP Network Element field, select from drop down menu, the gateway created. See screen capture below.


  1. The SIP Delayed Media Outbound feature is now configured. Below is screen capture of the Delayed Media Tree within.