Delayed Answer

(SS7 to SIP -and- ISDN to SIP)

Overview:

Feature F-1631 Delayed ANM is used in conjunction with the SIP REFER feature. In a normal SS7/ISDN to SIP call, the IMG would send an ANM/Connect message after receiving a 200 OK message and a Voice Path would be opened between the IMG and the PSTN. When feature F-1631 Delayed Answer is enabled, the CONNECT or ANSWER message is not sent immediately. Instead, the SIP device then transfers the call to a new destination which could be either SIP, H323, or PSTN. When the transfer target answers the call the ANM/Connect message is then sent back to the original PSTN caller. This feature is used mainly to delay billing charges until the call is connected to its final destination rather than starting billing time before the call is transferred. See Call Flow diagrams below. This feature is supported in SS7 to SIP and ISDN to SIP.

 

Call Flow Diagrams:

 

Delayed ANM Enabled (SS7 to SIP)

cf_f-1631_delayed_anm_enabled.png

 

Delayed ANM Disabled (SS7 to SIP)

 

cf_f-1631_delayed_anm_disabled.png

 

 

Configuration of Delayed Answer:

Initial Configuration:

The procedure below explains how to configure the IMG for feature F-1666. Verify the following entities are configured before proceeding:

 

Configure these initial objects before proceeding to the procedure below.

 

Create a Signaling Gateway Profile (SGP) for Delayed ANM.

  1. Right Click on the Profiles object and select New SIP SGP. In the SIP SGP object enter a name to identify this gateway profile in the Name field, change the SIP Profile ID to something other than ID:0. For more information on this pane see SIP SGP link.
  2. Right Click on the SIP SGP object just created and select New SIP REFER Support. The Delayed Answer Support feature cannot be enabled until after the REFER Support field has been enabled. Enable the REFER Support field by selecting ‘Enabled’ from drop down menu. Once this is done, the Delayed Answer Support field can now be changed.

  3. Click in the Delayed Answer Support field and select Enabled from drop down menu. See screen capture below.

    sc_sip_refer_support_en.png
     

  4. Right Click on 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.

  5. 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.

    sc_f-1631_sip_sig_pane_delayed_anm.png

    For more Information see SIP Signaling
     

Create SIP Channel Groups:

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

  2. Right Click on Routing Configuration and select New Channel Groups. The Channel Groups object is created to allow multiple channel groups get created under it. There is no configuration required in this object.

  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. See SIP Channel Group for more information on configuring a SIP channel group.

 

Create an External Network Element:

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

 

  1. Right Click on Dialogic IMG EMS and select New External Network Elements. The External Network Elements object is created to allow multiple external network element objects to be created under it. There is no configuration required in this object. See External Network Elements for more information.

  2. Right Click on External Network Elements object and select New External Gateways. The External Gateways object is created to be able to configure multiple gateways objects to be created under it. There is no configuration required in this object. See 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 this gateway. Select SIP from drop down menu in the Gateway Signaling Type field. See screen capture below.

    sc_f-1631_ext_gateway.png

 

Enter a Name into the Name field.

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

Enter IP address for this gateway

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

 

Insert SIP External Network Element into SIP Channel Group:

  1. Right Click on SIP Channel group and select New IP Network Element. Select the Gateway created under the External Network Elements that was just created. See screen capture below.

    sc_f-1631_ext_ip_network_element.png

 

Delayed Media ClientView Tree:

  1. Below is screen capture of ClientView Tree when finished configuring above procedure:

    sc_tree_f-1631_delayed_anm.png