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

[Lawrence E. Bakst]

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) ->