Specifications

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Cisco Unified Communications Manager Managed Services Guide, Release 8.0(1)
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Chapter 6 Cisco Unified Serviceability Alarms and CiscoLog Messages
Error-Level Alarms
InsufficientFallbackIdentifiers
Cannot allocate fallback identifier.
This alarm is generated when Unified CM is processing a IME call, and is attempting to allocate a PSTN
fallback DID and a DTMF digit sequence to associate with this call. However, there are too many IME
calls currently in progress which are utilizing this same fallback DID, and as a result, there are no more
DTMF digit sequences which could be allocated to this call. As such, this call will proceed, however
mid-call fallback will not be possible for this call.
Cisco Unified Serviceability Alarm Definition Catalog
CallManager/CallManager
Severity
ERROR
Routing List
SDL
SDI
Sys Log
Event Log
Alert Manager
Parameter(s)
Fallback profile name(String)
Fallback E.164 number(UInt)
Current number of DTMF digits(UInt)
E.164 called party number(String)
Recommended Action
Your first course of action should be to identify the fallback profile associated with this call. Its name
will be present in the alarm. Check that profile from the admin interface, and examine the current setting
for "Fallback Number of Correlation DTMF Digits". Increase that value by one, and check if that
eliminates these alarms. In general, this parameter should be large enough such that the number of
simultaneous IME calls made to enrolled numbers associated with that profile is always substantially
less than 10 raised to the power of this number. "Substantially" should be at least a factor of ten. For
example, if you always have less than 10,000 simultaneous IME calls for the patterns associated with
this fallback profile, setting this value to 5 (10 to the power of 5 is 100,000) will give you plenty of
headroom and you will not see this alarm.
However, increasing this value also results in a small increase in the amount of time it takes to perform
the fallback. As such, it should not be set arbitrarily large; it should be set just large enough to keep clear
of this alarm. Another alternative to increasing this parameter is to add another fallback profile with a
different fallback DID, and associate that fallback profile with a smaller number of enrolled DID
patterns. This will allow you to get by with a smaller number of digits.