Re: More incorrect messages from 1899/18866

Lem wrote:
A technical answer I got (which I don't truly understand) is at
http://snipurl.com/nojd and it said:

---------- START -----
This happens if a Service Provider has not fully implemented handling
of Connection Not Admitted reasons which are signalled between the
telephone exchanges involved in setting up a call.

In the situation you describe, the terminating exchange will have
signalled that the Called Party Number is BUSY and will have sent a
Connection Not Admitted message to the originating exchange which
says so. It's then up to the Service Provider as to whether they
bother/can tell the Calling Party.
---------- END -----

Think of it as a sequence as follows:

Calling Party dials 1899 <Called Party Number>
Calling Party is connected to the 1899 service
1899 dials <Called Party Number>
The Originating Exchange (which hosts 1899), various Trunk Exchanges
and the Termating Exchange (which hosts the Called Party) try to set up
the call.
BUT, the Called Party is engaged
The Terminating Exchange sends a Connection Not Admitted message to the
Originating Exchange, with the CNA Reason "Called Party is Engaged"

The problem about dodgy announcements may occur because when the
Originating Exchange receives the CNA Reason and passes it to 1899, the
latter does not understand the message. It's like when you are
learning to speak a foreign language but have a limited vocabulary, so
you use a subset to get by.


It seems to say that PERHAPS some exchanges somewhere are not
correctly set up. Am none too clear which ones. This may explain
the weird messages I get. But who do I contact ... my landline
provider or 18866/1899 and what are they supposed to do?

I use 1899 for almost all landline calls during the day and evening. I
have noticed over the past couple of weeks that more calls are not
being connected. I can only guess as to why, but a possibility is that
1899 are struggling to match capacity to demand. But at 4p per
connection and 0ppm I don't really care. If I want carrier-grade QoS I
just dial direct and pay BT call charges.

My concern for the long term would be if 1899 prices started increasing
and the QoS remained static or worsened.

.

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