[cisco-voip] intermittent missing outbound ring tone

[Wes Sisk]

Hi Leslie,

The next messages after setup are the ones that determine how the user 
hears ringback.  If the PSTN sends Proceeding, Alerting, or Facility 
with a Progress Indicator IE and that Progress Indicator ends in 8 then 
the IOS gateway and CM must cut through audio immediately.  This allows 
the user to hear any inband tones provided by the transit PSTN gear or 
by the far end customer premise equipment.

I am not aware of a single one-size-fits-all solution to this.  Some 
services, such as American Express, send PI=8 to play prompts to caller 
at the beginning of the call.  In this case it is necessary to cut 
through the audio.  You may call other CPE equipment that provide PI=8 
but then fail to provide inband audio of either announcement or ringback.

That said there are a few tools at your disposal:
http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a0080094c33.shtml

/Wes

On Wednesday, July 29, 2009 6:07:07 PM , Leslie Meade <lmeade at signal.ca> 
wrote:
>
>  
>
> Since converting my gateways to H.323, I am getting users reporting 
> that sometimes they do not get a ring tone when they ring people.
>
> It is not every time, not every number. It can be long distance or 
> international, it does not happen all the time.  Any ideas
>
>  
>
> I am running ccm7.1 and my gateway is a 2821 H.323
>
>
> 4743212: *Jul 29 14:42:22.891 UTC: ISDN Se0/0/0:23 Q931: 
> pak_private_number: Invalid type/plan 0x0 0x0 may be overriden; sw-type 13
>
> 4743213: *Jul 29 14:42:22.891 UTC: ISDN Se0/0/0:23 Q931: 
> pak_private_number: Invalid type/plan 0x0 0x0 may be overriden; sw-type 13
>
> 4743214: *Jul 29 14:42:22.891 UTC: ISDN Se0/0/0:23 Q931: Sending 
> SETUP  callref = 0x5AF1 callID = 0xDBB7 switch = primary-ni interface 
> = User
>
> 4743215: *Jul 29 14:42:22.895 UTC: ISDN Se0/0/0:23 Q931: TX -> SETUP 
> pd = 8  callref = 0x5AF1
>
>         Bearer Capability i = 0x8090A2
>
>                 Standard = CCITT
>
>                 Transfer Capability = Speech 
>
>                 Transfer Mode = Circuit
>
>                 Transfer Rate = 64 kbit/s
>
>         Channel ID i = 0xA9838B
>
>                 Exclusive, Channel 11
>
>         Facility i = 
> 0x9F8B0100A11502012E020100800D4B72797374792057696465656E
>
>                 Protocol Profile =  Networking Extensions
>
>                 0xA11502012E020100800D4B72797374792057696465656E
>
>                 Component = Invoke component
>
>                         Invoke Id = 46
>
>                         Operation = CallingName
>
>                                 Name Presentation Allowed Extended
>
>                                 Name = Krysty
>
>         Display i = 'Krysty'
>
>         Calling Party Number i = 0x2181, '604899XXXX'
>
>                 Plan:ISDN, Type:National
>
>         Called Party Number i = 0x80, '01152818421XXXX'
>
>                 Plan:Unknown, Type:Unknown
>
> 4743216: *Jul 29 14:42:22.931 UTC: ISDN Se0/0/0:23 Q931: RX <- STATUS 
> pd = 8  callref = 0xDAF1
>
>         Cause i = 0x80E328 - Information element not implemented
>
>  
>
> Leslie
>
>  
>
> ------------------------------------------------------------------------
>
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>   

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