CMX218S1 MX-COM, Inc., CMX218S1 Datasheet - Page 11

• Manufacturer Part Number: CMX218S1
• Description: ISDN data and telephony protocol engine
• Manufacturer: MX-COM, Inc.

ISDN Data and Telephony Protocol Engine (no X.25)
4.3.5
Multiple Subscriber Numbering (MSN) enables each POTS or RS232 port of the CMX218 to have its own
telephone number. Up to 23 digits can be saved as the MSN for each port.
All incoming SETUP messages will be checked for the presence of a Called Party Number Information
Element (IE). If one is present it is compared with the saved MSN number (if present), starting with the last
digit of both numbers. Comparison continues until there are no more numbers in the MSN saved number or
the incoming Called Party Number or there is a difference between the numbers. The MSN is said to match if
the saved MSN and the incoming calls’ Called Party Number are the same for the duration of the shorter
number (i.e. if the digit ‘1’ is saved and the received Called Party Number is 654321, then the MSN matches).
If there is no saved MSN, the Called Party Number is ignored and call processing continues.
When there is a saved MSN and the Calling Party Number transmit is enabled, all outgoing call SETUP
messages will contain a Calling Party Number Information Element.
Note:
1. When a CMX218 with MSN saved and Calling Party Number transmit enabled is connected to some
2. Disabling the Calling Party Number transmit will mean that the called party may not receive the Calling
4.3.6
It is possible to configure the CMX218 so that analog and/or digital ports will only originate calls to and
respond to calls from a specific ISDN B-channel. This is a useful feature if, for example, you wish to have a
Hunt Group on your ISDN line and only want one voice or data port to ring on an incoming call.
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
exchanges, no dial tone is heard when going off-hook.
Line Identification (CLI), or if they do receive a CLI it will probably be the base number and not the
number specific to the calling telephone.
Multiple Subscriber Numbering
Channel Mapping
11
2000 Chiron Technology Limited
CMX218 Advance Information
Doc. # 20480215.001
2000 MX-COM, Inc.