I used to work for a telco and on many occasions observed overlap sending on
ISDN's working fine. This while watching test instruments across live lines.
- so yeah - it's used out there for sure... Go for it.
From: Ian Batterbee [mailto:***@aut.ac.nz]
Sent: Friday, 23 September 2005 1:16 p.m.
Subject: Re: [nznog] Vodafone dial pattern - another change ?
Post by Steve Phillips
Surely the delay thing is why most VoIP type systems accept something
such as "#" as an "I've finished inputting my number, please dial it"
Although we do operate a VoIP system, that's largely irrelevant, because our
previous PBX (Ericsson MD110) had all the patterns configured into it as
well, so we would have been in the same situation. Users don't expect to
have to dial a # at the end of their number, and we shouldn't expect them to
have to do so.
Post by Steve Phillips
Is the 5 seconds tuneable ? "wait 5 seconds till the 5th digit has been
entered then change this to 3 seconds till the 7th digit then change
this to 1 second"
The 5-second delay is coming from TelstraClear.. so no, we can't tune it.
They're waiting for another digit, and when I posted about last month, it
was because TCL's pattern was actually incorrect, and was waiting for extra
digits that would never come, resulting in an unncessary 5 second setup
delay to a large number of 021 numbers. This has since been corrected.
A number of PBX systems validate the numbers so that they can match and
therefore route them down the most appropriate route. Our (Cisco) PBX comes
with patterns for most countries, which simplifies the task of setting up a
new system. While I agree NZ's plan is relatively simple, other countries
are not, and that's probably the reason they do it that way.
There is the possibilty that we could enable overlap sending.. which I
believe means that you send each digit as it is dialled, rather than all at
once in an ISDN SETUP message - as it gives the telco the option to send
back 'more needed', or 'that's enough digits'.. but.. I'm reluctant to turn
it on without some proper testing first.
Thanks to Barry who found the info I needed, and finally, to those of you
who do validate the numbers locally, and who were forced into silence before
posting anything by Steve's helpful comments, here are the new patterns:
021 0221 XXXX
021 0222 XXXX
I believe there may be more coming.
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