[cisco-voip] 2 stage inbound to FXO port issues

[Jeffrey Girard]

Simplified diagram is attached.  Lab network.

Scenario:  Using a 2811 router as a PSTN emulator.  Has a 2 port FXS card installed.  One port has an analog phone attached, other port is connected to a 4 port FXO card installed into a 2951 router.  2951 is H323 with CUCM 8.6.  Simple/test dial peers configured.  Snippets below:

PSTN Emulator:

!

voice-port 0/0/0

!

voice-port 0/0/1

!

!

!

!

dial-peer voice 1 pots

description Emulating legacy PATCOM number

destination-pattern 0999

port 0/0/1

!

dial-peer voice 2 pots

description Emulating tie line to Access Terminal

destination-pattern 9999

port 0/0/0

H323 Gateway Router

!

voice-port 0/1/0

trunk-group FXO

cptone PK

!

voice-port 0/1/1

trunk-group FXO

cptone PK

!

voice-port 0/1/2

trunk-group FXO

cptone PK

!

voice-port 0/1/3

trunk-group FXO

cptone PK

!

!

dial-peer voice 1 pots

description Incoming Call Routing

incoming called-number .

direct-inward-dial

!

dial-peer voice 2 voip

description Incoming Call Routing

incoming called-number .

voice-class codec 1

dtmf-relay h245-alphanumeric

no vad

!

!
voice-port 0/1/0
trunk-group FXO
cptone PK
!
voice-port 0/1/1
trunk-group FXO
cptone PK
!
voice-port 0/1/2
trunk-group FXO
cptone PK
!
voice-port 0/1/3
trunk-group FXO
cptone PK
!

!

dial-peer voice 999 pots

description Dummy dial peer to test BYOPBX

destination-pattern 0999

port 0/1/0

forward-digits all

!

I have other dial-peers on this router (not shown) that will take the inbound digits.  However, Im never able to pass the digits.

Calls from the VoIP network to the simulated PSTN work fine.  Calls from the PSTN to the VoIP network fail.

When I pick up the analog phone, I get the expected dial tone.  I enter "9999" and the call rings to the FXS port and I hear the FXO port answer.  I get the expected secondary (2 stage) dial tone, but then before I can press any digits, the FXo port hangs up and I am left with the PSTN router dial tone.

debug voip dialpeer on the H323 router shows no results at all when I try to place the call.

debug voip dialpeer on the PSTN router shows the expected dial peer matching and the expected result.  File is attached.

Additionally, when I observe the output of show voice port summary while I place the call, I see the FXS port (the one that is tied to the FXO port) go off hook and then go back on hook (file also attached)

So, the FXO port appears to be looking for something from the FXS when it answers the call, doesnt get it (or doesnt like what it gets) so it hangs up.

Looking for help...

Jeff
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