As promised in my previous post, I'm now getting back to you with the results
from my support ticket.
The gist of the replies is that I should change the expiration timeout to 900 seconds.
I did that, and it still makes no difference.
I have now used expiration timeouts of 240, 900, 1800 and 3600 seconds, all to no avail!
I'm still getting dropouts if the called party doesn't answer within about 35 seconds of my dialling
the first digit. If I retry straight away, I hear a lot of noise on the line, combined with another
busy signal. If I wait about 60 seconds and then retry, I can usually connect, provided the called
party had heard the phone ringing on my first try.
I can't tell you how many "rings" I'm getting, because the called party's phone transmits a music track,
which denotes to the caller that the phone is ringing, so I can't count the number of "rings."
The sound quality of a successful call is always quite satisfactory, and there are never any further
dropouts.
Once again, I must repeat, that this problem only appeared after the SIP server went down around
the end of May and was then restored after some days. No changes had been made to my modem setup,
so I just cannot see how the fault can be in my modem. After all, if the settings haven't changed, why
should it stop working, unless some incompatible changes have been made at the other end?
The only changes made to my modem setup (from the factory defaults) have been made at the request
of Exetel Telephone Support, and they haven't worked.
Also, it must be remembered that I have a backup VoIP account with Engin, which works fine, and the only
changes from the modem's factory default VoIP settings are the user ID, password, SIP server address and
changing the registration timeout from the modem default of 3600 seconds to 1800 seconds. The only slight
problem is that the sound quality is nowhere near as good as with my Exetel account, but still quite acceptable.
I really don't know where to turn from here. I really don't think that Support have the slightest idea what to do;
they even referred me an earlier post in this thread, (talking about the timing issue), to which I posted a reply
about three or four posts later, which was my first post to this thread!
Does anyone know how I can get this problem escalated? I'm rapidly losing confidence in the overseas support
personnel.
Thanks and regards
Chris Souter
