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Cisco Bug: CSCtd60595 - UCxn should not send 486 Busy Here when no ports available

Last Modified

Jan 08, 2010

Products (1)

  • Cisco Unity Connection

Known Affected Releases


Description (partial)


Unity Connection publisher and subscriber failover pair integrated via SIP trunks to CIsco Unified Communication Manager (CUCM) 7.1.3.  When all ports are busy on the subscriber (assuming Top Down call routing in CUCM where the subscriber is first in the Route Group and the publisher second), the next caller gets a busy tone.  No call is ever presented to the publisher server by CUCM.


Unity Connection cluster integrated via CUCM 7.1.3 or later via SIP trunks.

In CUCM, CSCsz93063 (RouteListExhausted Alert is raised ignoring Stop Routing Service Params) was integrated in 7.1(3), so that now CUCM no longer will continue routing the call when a 486 Busy is sent by Unity Connection.
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