Table 4: AT+ (Plus) Commands
Command | Option | Description | ||
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| +PMH=? | Display Modem on Hold Timer Status | ||
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+PMHR |
| Initiate Modem on Hold | ||
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| This command requests the modem to initiate the | ||
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| modem on hold procedure. If MH is disabled, or if | ||
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| the remote side rejects the request, an ERROR mes- | ||
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| sage is returned. Otherwise, the message | ||
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| “+PMHR:<t>” is returned, where <t> is the allowed | ||
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| timeout. | ||
+PMF |
| Modem Hook Flash | ||
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| ||
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| This command cause the modem to perform a flash | ||
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| hook operation. | ||
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+PQC |
| Phase 1 and Phase 2 control | ||
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| This command controls the use of full or shortened | ||
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| Phase 1 and Phase2 startup procedures. | ||
| +PQC=0 | Enable Short Phase 1 and Short Phase 2 | ||
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| +PQC=1 | Enable Short Phase 1 and Full Phase 2 | ||
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| +PQC=2 | Enable Full Phase 1 and Short Phase 2 | ||
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| +PQC=3 | Enable Full Phase 1 and Full Phase 2 | ||
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| +PQC=? | Display Quick Connect Status | ||
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+VCID |
| Caller ID Control | ||
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| This option takes effect only where the function is | ||
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| supported. Data/Fax modems do not support this | ||
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| option. | ||
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| +VCID=0 | Disable | ||
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| +VCID=1 | Enable | ||
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| +VCID=? | Display Caller ID Status (returns 0 or 1) | ||
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+VDR |
| Distinctive Ring Control and Report | ||
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| ||
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| This option takes effect only where the function is | ||
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| supported. Data/Fax modems do not support this | ||
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| option | ||
| +VDR=m,n |
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| Note |
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| If Distinctive Ring is enabled, the first ring |
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| reported by the modem may be incorrect. |
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| m options: | Specifies control | ||
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| 0 | Disable | ||
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| 1 | Enable | ||
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| n options: | Specifies reporting | ||
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| 0 | Produce DROFF/DRON report, no RING | ||
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