||What is a two way SMS
An SMS system that can send and receive SMS
When we are talking about two way SMS system we usually refer to systems, that
can submit messages to mobile users and can process SMS messages sent by
||When a mobile user replies to my SMS,
can I tell which message did he originally reply to?|
No, this is not possible.
The SMS technology does not provide any way to check if an incoming message is
a reply to a previously sent SMS or not. The reason for this is that there is no
such thing as a session identifier or discussion identifier in the SMS protocol
data unit (PDU). All message are independent from each other and are treated
as a single entity.
The only thing you can do is rely on keywords included in the message text, or
if you are lucky and you use IP SMS connection and your SMS service provider
supports long codes, you can include some extra digits in the sender telephone
number to identify the sent message.
||Can I use keywords to match replies
to submitted messages?|
Although the SMS technology does not provide any way to check if an incoming
message is a reply to a previously sent SMS or not, you can work around this
issue, by putting in a keyword into the message text itself. You can tell the
person who replies to the message to include that keyword in the message text.
If you use a unique keyword for a submitted message and
the keyword is included in the response, you can tell which message does the
response message belong to. The problem with this approach is that the mobile
user might forget to include the keyword in the message text.
||Can I use long codes to match
replies to submitted messages?|
Yes, if you have an IP SMS connection, and a network
that allows this.
The good news is that in some networks long codes are allowed to be used as
telephone numbers. A long code is a telephone number that has a postfix. E.g.:
+36201234678888, where 8888 is the postfix appended to
the standard telephone number +3620123467.
Long codes can be used through IP SMS connections in some networks. In these
networks the recipient (e.g.: +3620123467) will receive messages sent to any
telephone number that start with +3620123467. For example if an SMS message is
sent to +36201234678888 or to +36201234679999999, the
receiver, that has a phone number of +3620123467 will receive both. If you
can use a long code as the sender telephone number, because your network
supports it, you can include a message identifier
in the tail of the sender telephone number. This way if a reply comes back
to the long telephone number, you can tell which originally submitted message
it belongs to.
The problem with this approach that only a very limited number of Mobile
Networks allow long code telephone number formats.
||Are there any threats with
Yes, the biggest threat is a message loop.
If two autoresponding systems start to communicate with each other a message
loop can occur. Information on this can be found at:
This loop can create huge telephone bills for both parties in the loop.
Luckily Ozeki NG SMS Gateway has built in message loop prevention. It does not
allow message submission to the same telephone number with the same text more
then 10 times per hour.
||Can I query a database and return
data in a response SMS?|
The best way to do this is to setup an autoreply database user in Ozeki NG SMS
Gateway. More information about this can be found at:
||Can I return a webpage if I receive
a certain keyword in SMS?|
You cannot return a webpage, but you can return a
link to a webpage.
To create such a service, you need to use the WAP Push message type, that
allows you to send a webpage link to a cellphone. The cellphone can
automatically read this link and can open a webpage.
To create this service, please use the Autoreply easy user built into Ozeki NG.