User`s manual

AT Command Reference Manual
1048 3-57
Example 5:
Originate modem places speakerphone call to remote handset which is connected to the answer modem. The
originate modem switches from speakerphone mode to establish a AudioSpan/Speakerphone data connection between two
RCV288 modems. The originate DTE is set to 57600 bps and the answer DTE is set to 115200 bps:
Originate Modem Answer Modem
DTE DCE DTE DCE Comments
AT&F#CLS=8
#VLS=6#VRN=0
AT&F-SMS=2
#VLS=6
Modems are reset. Originate
modem is configured for
speakerphone call. Answer
modem is configured for
AudioSpan speakerphone call.
OK OK
ATDT5551212 RING Answer modem is called but user
picks up handset to establish
conversation.
VCON
AT#CLS=0 Originate modem switches to data
mode. Audio on both sides will be
muted while the originate modem
is in #CLS=0.
OK
AT-SMS=2
#VLS=6
Modem is configured for
AudioSpan with speakerphone
mode selected.
OK
ATD Originate modem initiates data
negotiation but will not actually
dial since the handset is already
offhook.
RING Answer modem detects
negotiation sequence and reports
RING message to DTE.
ATA DTE responds to RING by
answering.
CONNECT 57600 CONNECT 115200 AudioSpan is established and
users can resume conversation
on speakerphone. The connect
message represents the DTE
speed on each side.
<data> <data> Modems exchange data.
+++ Answer modem enters command
mode to prepare for disconnect.
OK
ATH
NO CARRIER NO CARRIER Modems disconnect in AudioSpan
mode and speakerphone
conversation is terminated.
Note:
The transition from handset conversation to AudioSpan mode can take up to 8 seconds. The handsets will be silenced
during the negotiation period.