We have a Cisco 2801 ISR running CUBE that is not forwarding a SIP message back to CUCM and it just sends another INVITE to the provider. Here is the SIP message received from the provider side when the called party is not answeringthe call:
SIP/2.0 480 Temporarily Unavailable
From: "XXX" <sip:XXX@XXX>;tag=9AD3C-986
Via: SIP/2.0/UDP XXX:5060;branch=z9hG4bK02268
CSeq: 101 INVITE
Reason: Q.850;cause=19;text="No answer from user (user alerted)"
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loadbalancing is one of the more complex items in hardware forwarding. of course we have talked about it many years on cisco live (id 2904) with ever incrementing more detail. and there is the support forum article on loadbalancing.
IntroductionArchitecture Building BlocksIOS-XR RoutersConfigurationPerformance VerificationOptimizationStrict timerSome more verificationThe CollectorInfluxDBDatabase statistics and HealthClosing comments
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