cause code 47 errors in CDR -- Resource unavailable, unspecified

[mcdonovan]

Hi,

We see lots of cause code 47 errors in CDR records for several of our customers 7.1.3 clusters.  Customor uses GK controller trunks for intercluster calls and H323 gateways for PSTN calls. No complaints about call drops or anything.  Could these be false alarms (e.g. someone calls a number in the DID range that is not configured)?

Below is output from one of the PSTN h323 gateway:

#show h323 gateway cause-codes

CAUSE CODE STATISTICS AT 9w0d

     DISC CAUSE CODE        FROM OTHER PEER    FROM H323 PEER
   0                                      1                 0
   1 unassigned number (1)               20               483
   3 no route to destinatio             126                31
  16 normal call clearing (            5590             24979
  17 user busy (17)                      32               858
  18 no user response (18)                0                 5
  19 no user answer (19)               1249                55
  21 call rejected (21)                   1                39
  27 destination out of ord               1               283
  28 invalid number (28)                  0               193
  31 normal, unspecified (3              42               553
  34 no circuit (34)                      0               187
  38 network out of order (              14                13
  41 temporary failure (41)              30                29
  42 switch congestion (42)               1                 4
  44 no requested circuit (               0                13
  47 no resource (47)                    65                 2
  63 service or option not                0                 8
  79 service not implemente               0                 4
  88 incompatible destinati               0                 2
  99 ie not implemented (99               0               294
102 recovery on timer expi              14                14
111 protocol error (111)                 3                 2
127 interworking (127)                   0                 4

Thanks!

-Mike

[hemurray · Accepted solution]

Typically, 47 cause code is due to a media resource that is a transcoder, MTP, etc... not being available. You should start by looking at CUCM traces for media resource allocation errors and verify that your codecs and regions settings are all correct.

[mcdonovan]

Thanks!  I'll have to track down a specific example of this in a CUCM trace.

[jtesar · Accepted solution]

Mike -

Cause code 47 typically indicates a problem with negotiating media.  Some scenarios where this can arise:

- Allocation of transcoder due to regions/codec.

- Allocation of CFB when attempting to conference.

- Allocation of MTP for DTMF (won't fail a call unless Service Parameter is set to fail call if MTP allocation fails).

If CM is sending the disconnect w/ cause 47, it typically means that CM could not allocate a media resource that is required in order for the call to connect.  Or, the media negotiation for the call might have timed out, ie. MxTimeout.

Detailed CM traces for a call which disconnects with cause 47 would help confirm what is happening.

-jt

[mcdonovan]

Thanks Jtesar.  Time to track down a specific trace for this!