[cisco-voip] Inserting a pause in an outbound dial with a PRI

[Robert Kulagowski]

 > On Feb 7, 2008 10:27 PM, Robert Kulagowski <rkulagow at gmail.com
 > <mailto:rkulagow at gmail.com>> wrote:
 >
 >     I have a site in Beijing, and the office used to prepend "96556" on
 >     their old PBX.  This prepend was a way to send the calls over an
 >     alternate, cheaper carrier.
 >
 >     I'm trying to do something similar using CM and H.323 gateways. 
When I
 >     manipulate the dialed number appropriately and prepend the 96556, my
 >     call completion went down the tubes - I'd get 2/3 of the calls 
failing
 >     to complete.  Since my techno-mandarin is non-existent, it's been 
a pain
 >     to troubleshoot.
 >
 >     One suggestion I received is that we need to pause after sending the
 >     96556, so that the PSTN class 4/5 switch that we're connected to 
has a
 >     chance to react before we send it the rest of the digits.
 >
 >     I'm not sure I know how to do that on a PRI, because when I look 
at the
 >     q931 debug, I see the called number go out in a single message.
 >
 >     Ideas?  CM 4.1.3, IOS 12.4(15)T1

Craig Staffin wrote:
> I ran into the same issue working with sites in China (Shanghai)
> 
> If it is ISDN you have no chance to do anything as far as delays.
> 
> However I do know that I had a lot of problems making sure that the ISDN 
> plan type was set correctly.  This took me a week with a very fluent 
> Mandarin/English translater.
> 
> If I remember correctly the city local 5-8 digit needs to be local and 
> all else needs to be international.
> 

No joy on that front.  I've done an isdn map address 96556* in the 
interface s0/1/0:15 and have tried national, international and 
subscriber(local).  I can see in the q931 that it's being set outbound 
to whatever I've configured in the isdn map, and it doesn't matter. 
Either way is failing to increase the call completion - anywhere from 
60-90% of the calls don't go through.

But then one _will_ go through, and it's a complete mystery why it did. 
  No config change on my end...

Did you hire a translator, or was it someone within your company?