SIP Redirect - IMG Initiated 302 response - Example:

Overview:

The IMG already supports receiving 3xx Redirection messages. Feature 1442 will add the ability to initiate a SIP Redirect by sending a 302 message back to the originating gateway with information of other IMG's in the route list or route table that the originating gateway can send the invite message to. Procedure below will explain configuration of SIP Redirect.

 

Related Topics:

SIP Redirect IMG Initiated 302

 

 

SIP Redirect Diagram:

DG_IMG_SIP_Redirect10.5.1.png

 

 

 

Procedure:

The procedure below walks you through configuring the IMG to be able to enable the SIP Redirect Feature. Please first read the topic SIP Redirect IMG Initiated 302 in the Related Topics above for an understanding of how the feature functions. The first few steps basically get the IMG configured like the diagram shown above and then the feature is enabled first by Route Table and then by Route List. The first heading "Create IMG's along with the facilities" can be skipped if the IMG is already configured with TDM and IP Spans.

 

Create IMG's along with the facilities:

  1. Configure three Physical IMG's. See Logical IMG and Physical IMG

  2. Create TDM Profile for TDM spans. See Config_T1_E1_Bearer_Profile

  3. Create IP Bearer Profile for and IP Bearer Spans. See IP Bearer Profile

  4. Create facilities for each of the three IMG's. See Config_T1_E1_BearerSpans

  5. Configure VoIP modules for IP Channels. See Network Interfaces

 

Create TDM Signaling:

Create the Stack, Links, Routes, etc on IMG 0. IMG 1 and IMG 2 will be remote SS7 nodes.

  1. Create SS7 signaling on IMG 0. Right click on the Physical IMG0 and select New Signaling. The signaling object will get created.

  2. Right Click on the signaling object and select New SS7. Leave Redundancy Configuration as StandAlone

  3. Right Click on SS7 Standalone and create Stack 0. Enter OPC. In this example the OPC will be 1-1-1.

  4. Right Click on the SS7 Stack and select New SS7 Link Set. Enter APC which will be 2-2-2 Point Code of PSTN in this example.

  5. Right Click on SS7 Link Set 0 and select New SS7 Link. Select IMG 0 from IMG field drop down list. The link will be on IMG 0 Span 0 Channel 0

  6. Right Click on SS7 Link Set 0 again and select New SS7 Route. Give the DPC a point code of 2-2-2 which is the PSTN Point Code.

  7. See Configuring SS7 Signaling - 10.5.1 for more information.

 

Create SIP Signaling:

  1. Each of the IMG's will need to have SIP signaling configured. See Configuring SIP Signaling for more information on how to configure SIP Signaling on each.

 

Create TDM Channel Groups:

For this feature to function properly there needs to be one TDM Channel Group with multiple ISUP Groups and CIC's configured under each ISUP group. See Diagram above.

  1. The next step is to create Channel Groups going from the IMG which will get connected to the PSTN. For this feature we will have to configure one channel group with three separate ISUP groups.

  2. Right Click on IMG EMS object and select New Routing Configuration. Commit this.

  3. Right Click on Routing Configuration and select New Channel Groups. Commit this.

  4. Right Click on Channel Groups and select New Channel Group. Enter a name for this channel group. In this example the channel group was named ChGrp1_SS7.

  5. Select SS7 from the signaling type field drop down menu. For more information see following link. Channel Group

  6. Right Click on ChGrp1_SS7 just created and select New ISUP Group. In the OPC-DPC field select the route that was configured when TDM signaling was created. In this example the OPC=1-1-1 and DPC=2-2-2. Click on link to display the ISUP Group Pane. ISUP Group 1

  7. Right Click on the ISUP Group created and select New Circuits. In the IMG Name field select IMG0. These CIC's will be connected to IMG0.  Click on link to display the ISUP Group Pane. CIC's on IMG0

  8. Repeat Step 6 and 7 for ISUP Group 2. This ISUP Group needs to be under the same Channel Group which was previously created. Click on link to display ISUP Group 2 and CIC'S on IMG1

  9. Repeat Step 6 and 7 for ISUP Group 3. This ISUP Group needs to be under the same Channel Group which was previously created. Click on link to display ISUP Group 3 and CIC'S on IMG2

  10. It is important that the ISUP Groups and CIC's all be part of the same channel group for the feature to function properly. Click on link to view Channel Group Tree

 

Create SIP Channel Groups:

  1. Right Click on the Channel Groups Object and select New Channel Group. Enter a name for this channel group. In this example the channel group was named ChGrp1_SIP.

  2. Select SIP from the signaling type field drop down menu. For more information see following link. Channel Group.

  3. Right Click on the Channel Group just created and select New IP Network element. Select IMG 0 from the drop down list. Click on link to display the IP Network Element 0 Pane.

 

Note: IP network element under SIP channel group should have IMG configured as PHYSICAL NODE. Feature will not work if under SIP channel group IMG is configured as EXTERNAL GW. For Route list explained below it can be configured either way.

 

  1. Create a second SIP Channel Group (ChGrp2_SIP) and IP Network Element. Click on link to display the IP Network Element 1 Pane.

  2. Create a third SIP Channel Group (ChGrp3_SIP) and IP Network Element. Click on link to display the IP Network Element 2 Pane.

 

Create Route Table:

The next few steps are for the Route Table portion of this feature. The Route List will be explained in next heading below.

  1. Right Click on Routing Configuration and select New Routing Tables. Commit this
  2. Right Click on Route Tables and select New Route Table. Give this Route Table a name in the Name field. In this example it was given 'RouteTable1'.
  3. In the field 'Would you like to redirect call' select Yes from drop down menu. See screen capture below. This enables the redirect to happen.

    SC_SIP_RouteTable_RedirectCall.png

  4. Create a Route Entry under the Route Table. Right Click on Route Table and select Add Route Entry. Fill in the Route Entry fields. Select the SS7 Channel Group (ChGrp1_SS7) as the Outgoing Channel Group. For more information on Route Table Entries see the following link. Route Entry

  5. Once the Route Table is created go back to each of the SIP Channel Groups and in the route table field select the route table just created. Click on following link to view Route Table entry in the SIP Channel Group. RouteTableEntry_in_SIP_ChanGrp. Enter Route Table in each SIP Channel Group.

 

 

Create Route List:

The next few steps are for the Route List portion of this feature. All configuration up to creating route table in the example above is valid. Rather than creating a Route Table you will create a Route List.

  1. Right Click on IMG EMS object tree and select New Routing Configuration. This will create a Routing Configuration object.

  2. Right Click on Routing Configuration object in object tree and select New Route Lists this will create a Route Lists object.

  3. Right Click on Route Lists object in object tree and select New Route List. A Route List Pane like will get created. Fill in the applicable fields. See the route list link for more information. Route List

  4. Right Click on the Route List object and select New Channel Group. A Pane like below will appear. Within this pane will be a selection for 'Channel Group Type'. The drop down menu will allow you to select Redirect. See Below

    SC_SIP_Redirect_RouteListPane.png
     

  5. Select from Group Name field one of the SIP channel groups. Click on following link to view the SIP Channel Group selections under the Route List. ChGroupSelection. Only SIP Channel Groups will be in this list

 

Note: The IMG supports up to three Channel Groups with the Redirect option selected to be created under the Route List object.