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Description

This trap alarm indicates that at least one SIP registrant has a source port number that changed over two or more consecutive REGISTER refreshes, possibly indicating that the registrant was unreachable from the SBC for a time.

The NAT between the SIP endpoint (IAD) and the SBC is closing its pinhole before the IAD sends a REGISTER refresh to the SBC.

Repetition

None

Event Codes

None

Instance Fields

None

Action

Check Registration refresh timing between IAD and SBC together with the NAT pinhole timing.

Impact

At least one SIP Registrant has a port number that keeps changing.

Clearing

Manual