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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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