Silicon Laboratories SI2493/57/34/15/04, SI2494/39 manual Speakerphone Automatic Pulse Dial

AN93

7.7.8. Call—Automatic Pulse Dial

Table 140 lists the commands that occur after the configuration defined in Table 136.

	Table 140. Speakerphone Automatic Pulse Dial
Host to Modem		Modem to Host Result	Local Modem Actions
Commands / Data		Codes/Data
			Perform automatic pulse dial of 102. Modem will return
ATDP102		OK	OK. The user will not receive <DLE> events for dial
			tone, ring-back, busy, and quiet since the detectors are
			disabled. See Table 122 on page 198 for details on
			active detectors.

7.7.9. Answer

A ring event will prompt the user to press the speakerphone button. This will generate a SP Button On Event and the Speakerphone Configuration procedure defined in Table 136 on page 219 should be used to answer the call. For ring detection and local ring tone/melody generation, see "7.6.2. TAM Hands-Free—Idle".

7.7.10. Handset Transition

For a SP Button Off Event (Handset Off-Hook), the voice driver should use the command sequence in Table 141 to return to the Handset mode. Note the voice driver is responsible for tracking the handset hook switch state.

Table 141. Speakerphone to Handset Transition

	Modem to Host
Host to Modem Commands / Data	Result Codes/	Local Modem Actions
	Data
AT:U199A	OK	Mute the microphone and speaker paths to
		the codec.
		Configure Si3000 Register 1:
AT:U72,0110	OK	Enable speaker driver
		Disable line output driver
		Disable telephone instrument driver
		Enable MBIAS output
		Configure Si3000 Register 5:
		10 dB Line In gain
AT:U72,05B3	OK	Mute Line In
		20 dB MIC input gain
		Enable MIC input
		Mute telephone instrument input
		Enable IIR filter
		Configure Si3000 Register 6:
AT:U72,065C	OK	0 dB RX PGA gain
		Disable Line Out
		Disable telephone instrument output
AT:U72,075E	OK	Configure Si3000 Register 7:
		0 dB RX PGA gain
		Enable SPKRL
		Mute SPKRR

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