Refer to the exhibit.
Which out-of-dialog SIP OPTIONS ping response put dial-peer tag 1111 into its current operational state?
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A. B. C. D. E.E.
SIP 503 Service Unavailable is commonly seen in a VoIP network when a SIP device (such as a SIP server) is knowingly unable to process a call.
Typically when this happens the endpoint that originated the Invite will try the next available host it receives in the SIP Contact header.