Help: How to handle interactive voice call via AT command

[Nemo Lee]

Hi,

A very simple question regarding the interactive call.
I want to know which AT command should be used when
input in some peer required key during a call session?
For example, you dial out to service number, after
connection, the peer request for selection, which AT
command should be used to send the selction to modem?

You: ATD1234
<connection built>
Peer: (please choose your selection, 0: red, 1: green,
2: yellow)
You: ???? (what the AT command herem if I want selcet
1)

Thanks a lot!
Nemo


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