... exec command or press the Enter key to start the session.The modem InOut command enables both incoming and outgoing calls. The alternative to this command is the default no modem inout command, ... AT commands documented in Table 4-4 are considered “standard” and should work on most modems.A CCNP or CCDP should be familiar with these commands. For many modems on the market today, commands ... using the AT commands. Configuration of the Attached ModemIn the early modem days, the Hayes command set was the de facto standard; however, there was never a ratified industry command set....