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Before the introduction of feature F-5761, if there were no resources available the IMG would send out a 503 Service Unavailable message to the incoming SIP network informing the SIP entity that there were no resources available. The 503 message sent would not give any indication as to whether the IMG itself was out of resources or whether the SS7 network on the outgoing side was out of resources. With the introduction of this feature, a user can distinguish whether the release “503 Service Unavailable” sent by IMG to the SIP entity was caused due to the IMG being out of resources or the outgoing SS7 network is out of resources. This feature will be disabled by default.
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Configure these initial objects before proceeding to the procedure below:
Create SIP Profile and SIP Headers object.
Right click on the Profiles object and select New SIP SGP. Modify the SIP Profile Id field so the ID is something other than ID:0. Once ID:0 is changed then the rest of the fields can be modified. Refer to the IMG 1010 - SIP Profile - 10.5.3 topic for more information on configuring this object.
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Right click on the Routing Configuration object and select New Channel Groups. The Channel Groups object is a container object for multiple channel group objects. Refer to the IMG 1010 - Channel Groups object for more information.
Right click on Channel Groups object and select New Channel Group. Set the Signaling Type field to SIP and enter a name for this channel group. Refer to IMG 1010 - Channel Group topic for more information on configuring a SIP Channel Group.
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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 parent 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 Gateways 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, and enter an IP address in the Gateway IP Address field. Refer to the IMG 1010 - External Gateway topic for more information on configuring the gateway object.
In the SIP Profile field, select from the drop down menu, the SIP Profile created earlier . Within the SIP Profile field select the SIP SGP created above for the Local/Remote cause code feature. See screen capture below.
Right click on the SIP channel group created earlier and select New IP Network Element. Select the gateway created above that has the Generic Notification SIP SGP associated with it.
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