>Andreas,
>
>This is a nice overview. One thing which I have been thinking about for a
>while had to do with if Customer B is not able to receive the message. It
>appears that Customer A's SMSC has to hold this message in its storage while
>it waits for Customer B to turn the phone on. How does the network of
>Customer B notify A's SMSC that it is available?
Excellent question. In that case you have different possibilities.
a) Customer A's SMSC never know if Customer B is online and simply
retries every 15 minutes. This often happens if you are roaming
b) Customer A's SMSC has access to Customer B's home location
register (HLR) and it will inform Customer A's SMSC when Customer B
gets online.
> Does A's SMSC have access
>to the flag in the HLR that states that it has a message waiting, or is this
>flag only available to SMSC's that are withint he B's network?
The flag doesnt help if messages are waiting. The could be waiting on
10 different SMSC's. The HLR would have to keep track which SMSC has
messages waiting for the customer. I think this only really works for
your home SMSC but not for roaming SMSC.
>Also one other point, during a reply, if the Reply-Path flag is set and
>Customer A is sending a reply to Customer B, my understanding is that the
>SMSC of Customer B (the customer receiving the reply) would be the one that
>stores the SMS. The SMSC of Customer A would be bypassed. Is this your
belief as well?
Hes happened to me once and I couldnt reply because the SMSC in use
(PacBell) was blocking me from going back to my friends phone over
them. The options in the phone say something like "Sender pays for
reply" meaning the sender adds an information that replies should go
over his home SMSC and he pays for it. That implies the recipient to
use A's SMSC for the path back. Happened to me but didnt work
presumably because the SMSC wasnt configured. for reverse billing.
--
Andreas Fink
Fink-Consulting
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