CMX228S1 MX-COM, Inc., CMX228S1 Datasheet - Page 13

• Manufacturer Part Number: CMX228S1
• Description: ISDN data and telephony protocol engine with x.25
• Manufacturer: MX-COM, Inc.

ISDN Data and Telephony Protocol Engine with x.25
4.5
4.5.1
The CMX228 supports ISDN keypad messages for control of Network Supplementary services either before
or during call establishment. When dialing a number (i.e. off-hook and dial tone audible on POTS port), or if a
call has been disconnected by the network but the POTS port has not yet gone on-hook, any keypad string
entered will be sent to the network as ‘Keypad Information Elements’ within INFORMATION messages.
Keypad strings are defined as the following sequences of digits, with the exception of the configuration strings
defined in the previous section:


When a call is connected, pressing the recall key results in all subsequent key presses being sent to the
network as ‘Keypad Information Elements’ within INFORMATION messages, until the handset is replaced.
The tones generated by the key presses are also passed down the B-channel, so the remote user will be able
to hear them.
4.5.2
An incoming POTS call is identified by the Bearer Capability Information Element of the SETUP message
being set to ‘Speech' or ‘3.1kHz Audio’. The call will be routed to the POTS port if it satisfies the following
three conditions:
When the call is routed to the port, the ringing signal for that port will be applied by means of the RING1 and
The call is answered when the port with ringing signal goes off-hook. The ringing signal is then stopped and
the ISDN call is connected to that port.
MX-COM, Inc
4800 Bethania Station Road, Winston-Salem, NC, 27105-1201, USA
www.mxcom.com tel: [phone] 744 5050 fax: [phone]
All trademarks and service marks are held by their respective companies
RING pins.
1
POTS Operation
Keypad Operation
$...
$ ...
Incoming POTS Calls
The port is on-hook.
The MSN saved for the port matches the Called Number in the incoming SETUP message, or no
MSN is specified for the port, or there is no Called Number in the SETUP message. See Section
4.3.5 for details of POTS port MSN selection.
The ISDN B-channel on which the call is placed (as indicated in the SETUP message) is compatible
with the channel-mapping configuration for the port. See Section 4.3.6 for details of POTS port
channel mapping selection.
...
13
2000 Chiron Technology Limited
CMX228 Advance Information
Doc. # 20480216.001
2000 MX-COM, Inc.