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outbound calls fail intermittently using H323 and FXO to PSTN

Running CCM 4.21, H323 gateways on 2811 ipvoice 12.4(4)T. Eight FXO ports connected to Verizon Centrex lines. Intermittently, when making an outbound call Cisco IP phone shows dialed number and call seems to be proceeding but after about 9 seconds IP phone goes back on hook. Never see connected, or hear ringing. If you redial 2 or 3 times the call goes through. You can see the call hitting the same FXO port. Below is output of first call failing and second call proceeding. Anyone ever see this before?? Saw similiar post that suggested overlapping dial-peers but to me mine look good??

Comm01Lewvr1#sh voice call status

CallID CID ccVdb Port DSP/Ch Called # Codec Dial-peers

0x18E8 3321 0x45BAC178 0/1/3 0/1:1 *95233009 None 1/16

1 active calls found

Comm01Lewvr1#sh voice call status

CallID CID ccVdb Port DSP/Ch Called # Codec Dial-peers

0x18E8 3321 0x45BAC178 0/1/3 0/1:1 *95233009 g711ulaw 1/16

1 active calls found

Also, see below example of outbound dial-peers. each FXO has the same three dial-peers each set has a different preference. Also, sh call history shows the failed call as "normal call clearing"

dial-peer voice 16 pots

destination-pattern 9[2-9]......

preference 2

port 0/1/3

forward-digits all

dial-peer voice 17 pots

destination-pattern 91..........

preference 2

port 0/1/3

forward-digits all

dial-peer voice 18 pots

destination-pattern 9911

preference 2

port 0/1/3

forward-digits all

1 REPLY
Green

Re: outbound calls fail intermittently using H323 and FXO to PST

If you can replicate the problem can you upload the debug voice ccapi inout

and the detailed CCM trace.

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