H323 gateway reoder tone

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Jun 16th, 2008
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I have CUCM version 6 running in standard configuration with a h.323 gateway connecting to Nortel PABX. When I make a call from an IP phone through the PABX to a PABX phone or a PSTN phone (which connects through the PABX) the call connects fine but when either party hangs up I get a re-order engaged tone .

Any ideas.

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Rajesh Revuru Mon, 06/16/2008 - 19:18
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What interface did you use for your integration with Nortel?

paulhardy Mon, 06/16/2008 - 19:53
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We are using a E1 with QSIG signaling . Here is some of the config.


voice call disc-pi-off

voice call convert-discpi-to-prog

voice rtp send-recv


voice service pots


voice service voip

signaling forward unconditional




voice class codec 1

codec preference 1 g711ulaw

codec preference 2 g711alaw

codec preference 3 g729r8




voice class h323 1

h225 timeout tcp establish 3


ontroller E1 0/0/0

pri-group timeslots 1-31

description Nortel B15


controller E1 0/0/1

pri-group timeslots 1-31

description Nortel B15

interface Serial0/0/0:15

no ip address

encapsulation hdlc

no logging event link-status

isdn switch-type primary-qsig

isdn timer T203 30000

isdn timer T310 60000

isdn overlap-receiving

isdn protocol-emulate network

isdn incoming-voice voice

no isdn T309-enable

no cdp enable

Rajesh Revuru Tue, 06/17/2008 - 09:24
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Config looks good, but i am not sure but did you try providing clocking on your E1 interfaces.

chris.fortner Tue, 06/17/2008 - 11:05
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Can you post a call that fails to disconnnect while running the following debug on the gateway?

debug isdn q931


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