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With the introduction of F-5948, the Call Proceeding message from the ISDN side will be interworked into a 183 Session Progress with SDP message when the value of the Progress Indicator parameter in the Call Proceeding message is either "1" or "8". By interworking these parameters, an early voice path can be established so the caller can hear a prompt played by the terminating endpoint. If no progress indicator is present or the value of the ISDN Progress Indicator is not "1" or "8" then the call will proceed as normal. The Call Proceeding message will be dropped and no SIP 183 Session Progress will be sent. Refer to the topics in the links below for more information.
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Example 1 - Receiving ISDN Progress after CALL PROCEEDING
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IMG receives a SIP INVITE from SIP network and sends SETUP to the ISDN network. IMG receives CALL PROCEEDING with Progress Indicator No. 1 or No. 8. IMG will send 183 Progress message back to SIP network and voice path is established. The Caller from the SIP network can hear the prompt being played from the ISDN side. On receipt of ISDN PROGRESS message with Progress Indicator No.1 or No.8, IMG will send another 183 Session Progress with SDP back to the sip network and caller will continue to hear the prompt which is sent from the ISDN network. IMG then receives the ISDN CONNECT message and sends a 200 OK back to SIP network. |
Example 2 - Receiving ISDN CONNECT after CALL PROCEEDING
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IMG receives a SIP INVITE from SIP network and sends SETUP to the ISDN network. IMG receives CALL PROCEEDING with Progress Indicator No. 1 or No. 8. IMG will send 183 Progress message back to SIP network and voice path is established. The Caller from the SIP network can hear the prompt being played from the ISDN side. IMG then receives the ISDN CONNECT message and sends a 200 OK back to SIP network. |
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Example 3 - Receiving ISDN ALERTING after CALL PROCEEDING
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IMG receives a SIP INVITE from SIP network and sends SETUP to the ISDN network. IMG receives CALL PROCEEDING with Progress Indicator No. 1 or No. 8. IMG will send 183 Progress message back to SIP network and voice path is established. The Caller from the SIP network can hear the prompt being played from the ISDN side. On receipt of ALERTING message, IMG will not send any message back to the SIP network and the caller will continue to hear the same ring back tone. IMG then receives the ISDN CONNECT message and sends a 200 OK back to SIP network. |
Example 4 - Receiving ISDN CALL PROCEEDING
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IMG receives a SIP INVITE from SIP network and sends SETUP to the ISDN network. IMG receives CALL PROCEEDING without any Progress Indicator or the Progress Indicator is not No.1 or No.8. IMG will not send any message back to the SIP network On receipt of the ISDN ALERTING message, IMG will send 180 Ringing back to the SIP side. On receipt of ISDN CONNECT message, IMG SENDS 200 OK back to the SIP network. |
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Right click on the Signaling object and select New ISDN. A ISDN D-Channels object will get created. This is a container object and no configuration is needed here. Refer to the IMG 1010 - ISDN Signaling Pane topic for more information on this object.
Right click on the ISDN D-Channels object and select New ISDN D-Channel. Configure the D-Channel in this object. Refer to the IMG 1010 - ISDN D Channel topic for more information on configuring this object.
Right click on IMG EMS and select New Routing Configuration. A Routing Configuration Pane will appear. Refer to the IMG 1010 - Routing Configuration topic for more information on this object.
Right click on Routing Configuration and select New Channel Groups. A Channel groups container object is created. This object will allow multiple channel groups to be created beneath it. Refer to the IMG 1010 - Channel Groups topic for more information on this object.
Right click on the Channel Groups Object and select New Channel Group. A Channel Group Object will appear. Enter a name for this channel group and set the Signaling Type to ISDN. In this example, the channel group was labeled ChGrp_ISDN. Refer to the IMG 1010 - Channel Group topic for more information on configuring this object.
Right click on the ISDN Channel group just created and select New ISDN Group. Select a D-Channel from drop down menu in the ISDN D channel field.
To enable the Interworking of the Call Proceeding message, the Call Proceeding IW Procedure field must be set to Enabled. Select Enabled from drop down menu in this field. See screen capture below.
Refer to the IMG 1010 - ISDN Group topic for more information on configuring this object.Right click on the ISDN Group object just created and select New ISDN Circuits. Select which spans/channel will be utilized in this ISDN circuits group. Refer to the IMG 1010 - ISDN Circuits topic for more information on configuring this object.
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Right Click on the Profiles object and select New SIP SGP. Once SIP SGP pane is created, change the SIP Profile Id field to something other than 0 by selecting a different ID from the drop down menu. This will allow user to edit the SIP Profile (SGP) object.
Enter a name in the SIP Profile Name field that identifies the SIP Profile (SGP) being created. In this procedure, the SIP Profile (SGP) object was labeled Call_Proceeding_Profile. Refer to IMG 1010 - SIP Profile - 10.5.3 topic for more information on configuring this object.
Right Click on the SIP SGP Profile object and select New SIP_ISDN Interworking. In the SIP_ISDN Interworking object that appears select Enabled from the drop down menu in the Call Proceeding IW Procedure field. See screen capture below.
Refer to the IMG 1010 - SIP_ISDN Interworking topic for more information.
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Right click on IMG EMS and select New External Network Elements. No configuration is accomplished here. The External Network Element pane is a container object to multiple external entities in the network. Refer to IMG 1010 - External Network Elements topic for more information.
Right click on the External Network Elements object and select New External Gateways. Again, no configuration is accomplished here. Refer to IMG 1010 - External Gateway object for more information.
Right click on External Gateways object and select New External Gateway. Enter a name to identify this gateway, modify the Gateway Signaling Protocol field to display SIP. In this procedure the External Gateway was labeled ISDN_SIP_IW_GW.
Enter the IP address of the Gateway in the Gateway IP Address field. In the SIP Profile field, select from drop down menu the SIP Profile (SGP) create earlier for this feature. Refer to screen capture below.
Refer to the IMG 1010 - External Gateway topic for more information.
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Right click on Channel Groups object created earlier and select New Channel Group. Set the Signaling Type field to SIP and enter a name for this channel group. In this procedure the SIP Channel Group was labeled ISDN_SIP_IW_ChGrp. Refer to the IMG 1010 - Channel Group topic for more information on configuring a SIP Channel Group.
Right Click on the SIP channel group created and select New IP Network Element. Select from the drop down menu in the IP Network Element field the External SIP Gateway configured for this feature. See screen capture below.
Configuration Tree
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