[cisco-voip] FXO calls disconnect when answered

[Kris Seraphine]

Hi

I've been struggling with this issue for over a month and both I and TAC
seem to be stumped.

I have a customer with a small office that we are trying to migrate to a
centralized CCM cluster.  They have a 1760V with 4 analog lines that we want
to connect to an FXO card. When we connect the lines to the router for
testing I get the following behavior.

PSTN caller calls into the system.
The IP phone user hears the phone ring and answers the call.
The IP phone user sees the call disconnect After a second or two, the call
begins to ring again on the IP phone If the IP phone user answers the call
again, the call disconnects and the process repeats The PSTN caller hears
ringback the whole time.

The problem seems to be that the router is interpreting a disconnect coming
from the telco.

Trace snippet:-
008192: .Jul 31 08:36:28.484: htsp_process_event: [2/0,
FXOLS_PROCEEDING,
E_HTSP_CONNECT]fxols_offhook_connect
008193: .Jul 31 08:36:28.488: [2/0] set signal state = 0xC timestamp = 0
008194: .Jul 31 08:36:28.488: htsp_timer_stop
008195: .Jul 31 08:36:28.488: htsp_process_event: [2/0, FXOLS_CONNECT,

E_HTSP_VOICE_CUT_THROUGH]fxols_connect_proc_voice
008196: .Jul 31 08:36:28.716: htsp_process_event: [2/0, FXOLS_CONNECT,

E_DSP_SIG_0100]fxols_normal_battery
008197: .Jul 31 08:36:28.744: htsp_process_event: [2/0, FXOLS_CONNECT,

E_DSP_SIG_1100]fxols_offhook_disc

I've talked to the CO guy but he's been little help.  I did have them run a
ground start trunk for testing but it exibits the same behavior.

I've tried every combination of battery-reversal supervisory disconnect
etc... that I can think of but I cannot seem to solve this problem.

TAC does not think its hardware related but I'm going to send a replacement
router out just in case.

I'm hoping someone might have some suggestions for me.

Thanks in advanced.

Kris Seraphine
CCIE No. 15163, MCSE
Kris.Seraphine at cliftoncpa.com




-- 
kris seraphine
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