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The issue occurs on ISR4K utilizing a PRI that has hair pinned calls. This issue is typically during periods of high call volume. The customer will notice calls will not setup when the issue happens. Previous to this, calls will connect and setup normally. When checking show voice call summary, show voice call status, and show voice dsp active, no stuck sessions are observed. However, in this defect, the dsp resource manager process thinks that there are stuck calls and rejects new calls as a result.
This defect is caused by the fix for bug CSCvr76534 AND hairpin call flows. The calls fail in the flex process trying to allocate a resource with credits.
Switch to an IOS version without the fix for CSCvr76534 or Ensure there are no hairpin call flows over the ISR4K. or reload the gateway or the module. NOTE: This is a temporary fix because the issue will come back.
The errors below will be seen when this issue occurs: flex_dsprm_find_voice_dsp_load_balancing: local dsp search FAILED! %FLEXDSPRM-5-OUT_OF_RESOURCES: No dsps found either locally or globally. %VOICE_IEC-3-GW: VTSP: Internal Error (DSP unknown failure): IEC=1.1.182.9.22.2 on callID -1 (if voice iec syslog is enabled) Debug Snippet: Kflex_dsprm_vtsp_open flex_dsprm_vtsp_open - calling voice connect flex_dsprm_voice_connect flex_dsprm_voice_connect: caLLED cdb 0x7FF9AD4BBD08 sdb 0x7FF9B3FE5550 htsp 0x7FF9B3FD9A10 sig 0x7FF9BD6B4960 flex_dsprm_find_free_voice_channel lookup_codec_credits: NR=0, ASP=0, codec:5, srtp:0, credit:15 flex_dsprm_find_voice_dsp_enhanced_basic flex_dsprm_find_voice_dsp_load_balancing flex_dsprm_find_voice_dsp_load_balancing: local dsp search FAILED! %FLEXDSPRM-5-OUT_OF_RESOURCES: No dsps found either locally or globally. flex_dsprm_voice_connect: originating:0 fxo:0 appl:0 %VOICE_IEC-3-GW: VTSP: Internal Error (DSP unknown failure): IEC=1.1.182.9.22.2 on callID -1 The debug used to isolate the issue is: debug dsp-resource-manager flex all
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