Reference Guide for the Model XM128 ISDN Digital Modem
User-To-User Information
The Model XM128 modem supports
this command. The message is included in a
If the ATT4<message.....> command is issued before dialing, the
is sent in the setup message. Whether the information element can be sent to the called party or not is switch dependent. If the switch supports this information element, the called party can see the message before the call is answered.
During a call connection session, the D channel is still used to exchange
The
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