AW: [cisco-voip] No Busy tone

[Wes Sisk]

Default False is the "safest" answer from a system perspective.  DMS 
protocols pre-ISDN ratification did not allow media channels after 
DISCONNECT.  In internetworking [ i.e. 
CO----(q931)---router--(h323)---CM the conversion between q931 and h323] 
CM loses all visibility into what the CO ISDN protocol is so we cannot 
know if the q931 variant allows media after disconnect.  In the router 
world we originally had many DSPTimeout (remember that fun?) caused by 
this exact call flow and attempting to keep DSP's allocated after 
DISCONNECT.

/Wes


Bernhard Albler wrote:

>Ok, thanks for the clarification.
>I will have to check the CCM we originally opened the case for. If the param is set to false, I'm rather surprised TAC didn't point us there. 
>
>What would be a reason to set the enterprise param specifically to false? Are there any negative consequences?
>
>Best regards
>bernhard
>P.S.: Wes, you rule :-)
>-----Ursprüngliche Nachricht-----
>Von: Wes Sisk [mailto:wsisk at cisco.com] 
>Gesendet: Montag, 12. September 2005 22:48
>An: Bernhard Albler; cisco-voip at puck.nether.net
>Cc: Nick Kassel
>Betreff: RE: [cisco-voip] No Busy tone
>
>This command:
>
>voice call convert-discpi-to-prog
>
>instructs IOS to convert a Disconnect message with progress indicator IE to
>a Progress message with progress indicator IE.
>
>In Nick's case this message:
>*Sep 17 12:49:17.964: ISDN Se1/0:15 Q931: RX <- DISCONNECT pd = 8  callref =
>0x8BA0
>        Cause i = 0x8A91 - User busy
>        Progress Ind i = 0x8288 - In-band info or appropriate now available
>
>Would be reformatted before being extended back to callmanager over h323
>
>Carrier---(Q.931)---Router--(H.323)---CallManager
>->Disconnect                 ->Progress
>
>This is an 'interesting' message translation that avoids using the CM
>service parameter
>"Retain Media on Disconnect with PI for Active Call"
>
>Where the idea is that a Disconnect message is received with a progress
>indicator.  Usually Disconnect means to immediately disconnect the call, but
>the progress indicator means the PSTN or remote switch has some inband
>information it would like to pass back to the calling party.
>
>/Wes
>
>-----Original Message-----
>From: Bernhard Albler [mailto:balbler at nts.at]
>Sent: Monday, September 12, 2005 12:46 PM
>To: cisco-voip at puck.nether.net
>Cc: Nick Kassel; Wes Sisk
>Subject: AW: [cisco-voip] No Busy tone
>
>
>Ok, nice to hear J
>Wes, can you actually give more insight regarding this?  As far as I
>understand it, this is really only a workaround.These were the bug ids given
>to me by TAC:
>
>
>CSCsb18809
>And
>CSCsb18809
>
>SR was 601452939
>
>Best regards
>bernhard
>
>
>
>
>Von: Nick Kassel [mailto:Nick.Kassel at Charles-Stanley.co.uk]
>Gesendet: Montag, 12. September 2005 18:32
>An: Bernhard Albler
>Cc: cisco-voip at puck.nether.net
>Betreff: RE: [cisco-voip] No Busy tone
>
>Hi Bernard
>
>Sorry yes, I added your command and it worked perfectly.
>
>Thanks again
>
>Nick
>
>
>
>
>From: Bernhard Albler [mailto:balbler at nts.at]
>Sent: Monday, September 12, 2005 5:07 PM
>To: Nick Kassel
>Subject: AW: [cisco-voip] No Busy tone
>
>Nick,
>just a quick question, since there was no followup.
>Have you tried the command below?
>We had the exact same problem and it was traced to a bug by tac. The command
>however fixed it.
>
>
>
>
>Von: cisco-voip-bounces at puck.nether.net
>[mailto:cisco-voip-bounces at puck.nether.net] Im Auftrag von Bernhard Albler
>Gesendet: Montag, 12. September 2005 14:51
>An: Nick Kassel
>Cc: cisco-voip at puck.nether.net
>Betreff: AW: [cisco-voip] No Busy tone
>
>Hi,
>
>We experienced stuff like this recently.
>Put the following into the gateway config:
>
>voice call convert-discpi-to-prog
>
>that should at least work around the problems.
>
>regards
>bernhard
>
>
>
>Von: cisco-voip-bounces at puck.nether.net
>[mailto:cisco-voip-bounces at puck.nether.net] Im Auftrag von Wes Sisk
>Gesendet: Montag, 12. September 2005 14:46
>An: Nick Kassel; cisco-voip at puck.nether.net
>Betreff: RE: [cisco-voip] No Busy tone
>
>Is the called number onnet or offnet?
>Can you send a debug isdn q931 from the gateway?  CM needs to receive a
>disconnect message with a progress indicator Information Element to know to
>cut through audio and receive the busy tone from the destination.
>
>/Wes
>-----Original Message-----
>From: cisco-voip-bounces at puck.nether.net
>[mailto:cisco-voip-bounces at puck.nether.net]On Behalf Of Nick Kassel
>Sent: Monday, September 12, 2005 8:39 AM
>To: cisco-voip at puck.nether.net
>Subject: [cisco-voip] No Busy tone
>I have an issue with one of my remote sites where they are not getting a
>busy tone when they dial a number that is engaged, instead of saying Busy
>the phone display says Call Proceed and it goes silent.
>
>Not quite sure how long this has not been working for, can anyone help with
>this we are running 4.1(3) with H323 gateways.
>
>
>
>
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>Charles Stanley Sutherlands and Tozer Wingate are divisions of Charles
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