Symptom
Most of the calls around 30 % of outbound calls are getting dropped with " Cause i = 0x80AF - Resource unavailable, unspecified" and Cause 47
The call flow:
jabber/ Ip phones >>>>>> SIP >>>> CUCM >>>>> H323/SIP >>>>>> GW >>>>> PRI
Initially all the calls which will try to use a particular channel say 26 will fail. Slowly , this will spread to other channels. I have noticed a list of 3 to 4 channels unusable in customer setup
I have checked that there is no hung DSPs / FPI or any other resources.
The Channels are free and there is literally noting stuck.
From the logs , looks like the issue is between CDAPI and TSP Layer.
TSP:(0/1/2:15):-1/ABAD/cdapi_tsp_proceeding:
Progress Indication=0, Call Type=2, Early TDM Connect Indicated=TRUE, DSP-Less Call=FALSE
10566843: Jul 31 16:00:28.416: flex_dsprm_htsp_tsp_map: dchan_idb 0x7F4FF7B2BE68, tsp_cdb 7F4FD3B42A40, bchan 25
10566844: Jul 31 16:00:28.416: mars_flex_dsprm_htsp_tsp_map htsp 7F4FF7C2DCD8 bchan 25
10566845: Jul 31 16:00:28.416: //74835/80AB1913F433/TSP:(0/1/2:15):25/ABAD/cdapi_tsp_proceeding:
CALL_ERROR; Unable To Perform Cut Through
CDB=0x7F4FD3B42A40, Cause Value=47
10566868: Jul 31 16:00:28.417: %VOICE_IEC-3-GW: VTSP: Internal Error (No voice cut through): IEC=1.1.182.9.28.1 on callID 74835 GUID=80AB19137C6B01B6F433EE020A660500
Conditions
High PRI call volume .
Some TDM-Hairpin call flows.
Workaround
1. Use "no local-bypass" under the voice-card
eg,
voice-card 0/4
no local-bypass
2. Reset the DSPs by reloading the NIM module
hw-module sub 0/4 reload
