[cisco-voip] "show voice trace" and "battery-reversal answer"

[Wes Sisk]

power denial is just disconnect supervision. this is normal for 
residential loopstart lines

"battery-reversal answer" addresses the case of an inbound call is 
processing, originating from the PSTN, if the originating party 
disconnects the call 1st, the FXO port stays up. The PSTN uses battery 
reversal to attempt to signal call disconnect during the ringin state.

Another customer reported that disconnect was still not being detect. 
Resolution was "supervisory disconnect dualtone mid-call" and "timeouts

answer-release to 1" solved the problem. After adding this config battery reversal at ringin was properly detected.


As for the bits 0110, 0100, etc.  these are basically the ABCD bits used 
for T1-CAS (T1, but not pri) just masked to match the state transitions 
associated with analog signaling.

What version of IOS are you using on this router?

/Wes

Lawrence E. Bakst wrote:

>1. I had a problem where an outbound voice pots dial-peer fails to 
>"seize" a FXO line. Sometimes I hear dial tone for a very short 
>period, sometimes not at all. Changing the cable fixed it.
>
>In the failure case I saw the following differences in "show voice call trace":
>
>1385785.956 (FXOLS_OFFHOOK, E_DSP_SIG_0110) ->
>1385786.232 (FXOLS_CONNECT, E_DSP_SIG_0100) ->
>1385786.252 (FXOLS_POWER_DENIAL, E_HTSP_RELEASE_REQ) ->
>
>Anyone have any info on the states and events for these state 
>machines and what these mean? Cisco and Google have nothing. "Power 
>Denial" and "E_DSP_SIG_0110" would seem to be the clues. The port in 
>question was configured as follows:
>
>voice-port 0/0/5
>  trunk-group outbound 3
>  translation-profile incoming add-leading-one
>  battery-reversal answer
>  output attenuation 0
>  no vad
>  connection plar opx 202
>  impedance complex1
>  caller-id enable
>!
>
>See more detailed voice trace info below.
>
>
>2. Does "battery-reversal answer" make sense for a residential ground 
>start POTS line?
>
>Best,
>
>leb
>
>
>FAILURE CASES:
>0/0/5 State Transitions: timestamp (state, event) -> (state, event) ...
>1385785.684 (FXOLS_ONHOOK, E_HTSP_SETUP_REQ) ->
>1385785.684 (FXOLS_WAIT_DIAL_TONE, E_HTSP_EVENT_TIMER) ->
>1385785.688 (FXOLS_WAIT_DIAL_DONE, E_DSP_DIALING_DONE) ->
>1385785.712 (FXOLS_WAIT_CUT_THRU, E_HTSP_VOICE_CUT_THROUGH) ->
>1385785.956 (FXOLS_OFFHOOK, E_DSP_SIG_0110) ->
>1385786.232 (FXOLS_CONNECT, E_DSP_SIG_0100) ->
>1385786.252 (FXOLS_POWER_DENIAL, E_HTSP_RELEASE_REQ) ->
>1385788.248 (FXOLS_GUARD_OUT, E_HTSP_EVENT_TIMER) ->
>1385788.248 (FXOLS_ONHOOK, E_DSP_SIG_0100) ->
>chatter#
>
>chatter#show voice trace 0/0/5
>0/0/5 State Transitions: timestamp (state, event) -> (state, event) ...
>1386742.000 (FXOLS_ONHOOK, E_HTSP_SETUP_REQ) ->
>1386742.000 (FXOLS_WAIT_DIAL_TONE, E_HTSP_EVENT_TIMER) ->
>1386742.000 (FXOLS_WAIT_DIAL_DONE, E_DSP_DIALING_DONE) ->
>1386742.004 (FXOLS_OFFHOOK, E_DSP_SIG_0100) ->
>1386742.028 (FXOLS_OFFHOOK, E_HTSP_VOICE_CUT_THROUGH) ->
>1386742.272 (FXOLS_OFFHOOK, E_DSP_SIG_0110) ->
>1386742.560 (FXOLS_CONNECT, E_DSP_SIG_0100) ->
>1386742.584 (FXOLS_POWER_DENIAL, E_HTSP_RELEASE_REQ) ->
>1386744.580 (FXOLS_GUARD_OUT, E_HTSP_EVENT_TIMER) ->
>1386744.580 (FXOLS_ONHOOK, E_DSP_SIG_0100) ->
>chatter#
>
>WORKING CASES:
>chatter#show voice trace 0/0/5
>0/0/5 State Transitions: timestamp (state, event) -> (state, event) ...
>1385832.944 (FXOLS_ONHOOK, E_HTSP_SETUP_REQ) ->
>1385832.948 (FXOLS_WAIT_DIAL_TONE, E_HTSP_EVENT_TIMER) ->
>1385832.948 (FXOLS_WAIT_DIAL_DONE, E_DSP_DIALING_DONE) ->
>1385832.972 (FXOLS_WAIT_CUT_THRU, E_HTSP_VOICE_CUT_THROUGH) ->
>1385836.000 (FXOLS_OFFHOOK, E_HTSP_RELEASE_REQ) ->
>1385837.996 (FXOLS_GUARD_OUT, E_HTSP_EVENT_TIMER) ->
>1385837.996 (FXOLS_ONHOOK, E_DSP_SIG_0100) ->
>chatter#
>
>chatter#show voice trace 0/0/5
>0/0/5 State Transitions: timestamp (state, event) -> (state, event) ...
>1386742.000 (FXOLS_ONHOOK, E_HTSP_SETUP_REQ) ->
>1386742.000 (FXOLS_WAIT_DIAL_TONE, E_HTSP_EVENT_TIMER) ->
>1386742.000 (FXOLS_WAIT_DIAL_DONE, E_DSP_DIALING_DONE) ->
>1386742.004 (FXOLS_OFFHOOK, E_DSP_SIG_0100) ->
>1386742.028 (FXOLS_OFFHOOK, E_HTSP_VOICE_CUT_THROUGH) ->
>1386742.272 (FXOLS_OFFHOOK, E_DSP_SIG_0110) ->
>1386742.560 (FXOLS_CONNECT, E_DSP_SIG_0100) ->
>1386742.584 (FXOLS_POWER_DENIAL, E_HTSP_RELEASE_REQ) ->
>1386744.580 (FXOLS_GUARD_OUT, E_HTSP_EVENT_TIMER) ->
>1386744.580 (FXOLS_ONHOOK, E_DSP_SIG_0100) ->
>
>
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