CSCsx67255 Bug Details ISDN Call Failure w/ cause 47 after DSP Allocation Failure on Channel Symptoms: An outgoing call from an IP phone to PSTN through ISDN PRI fails on a channel due to a DSP allocation failure (not enough DSPs to support the call). Subsequent calls through that same channel continue to fail with "resource unavailable" cause value equal to 47 even after DSP resources have been made available to handle the call.
Conditions: The symptom occurs on a router running Cisco IOS Release 12.4(15)T8 or higher. The call must first fail with a legitimate DSP allocation error. Any call made through the same channel as the failed call will also fail.
DSP allocation failures on gateway can be checked through the use of the exec command show voice dsp group all. The last line of the show command output includes a counter for "DSP resource allocation failure".
This issue can be seen also in some cases upon bootup. When a gateway is reloaded, system resources will come up with slightly different timing. If, for example, a PRI interface comes up before the DSP resources have fully initialized, there may be a similar failure.
1. Reload the router to clear the channel. If a reload cannot be done, busy out the channel with the failed calls using the isdn busy b_channel command under the serial interface.
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...