IP LDK-20 Programming Manual System Feature
169
2.14.8 MSN/Sub-Addressing
Description
When several ISDN devices are connected to a single ISDN port, the numbering method of each
station is as follows;
MSN (Multiple Subscriber Number)
MSN provides the possibility for assigning multiple ISDN numbers to a single interface. It allows
dialing from a line connected to a public network directly to terminals connected to a basic access
which has subscribed to MSN number. The figure 2.14.7 describes the flow chart of MSN call
process in IP LDK system.
Sub-Addressing
The sub-addressing allows the called user to expand his addressing capacity beyond the one given
by the ISDN number.
Figure 2.14.7 The flow chart of MSN call process in IP LDK system.
Condition
1. To use an ISDN line as MSN, the CO Service type should be set to DID/MSN.
2. The MSN can be assigned up to 250 ISDN numbers with MSN table.
3. MSN is carried from PX in CPN IE (Called Party Number Information Element)
4. If the received CPN is not matched with MSN table, the call will be operated as DID.
5. If a MSN call is received with an ISDN CO line and there are MSN table entries filled with the CO
field value, then only the MSN table entries of MSN CO programmed will be searched. But, if there
is no MSN table entry filled with the CO field value, then all MSN table entries will be searched.
Set the line with DID
Search matched number
with TEL field in PGM202
Matched?
(Only Tel
Yes
No
General DID Flow
Provide call to valid
destination
Yes
No
: PGM140 FLEX1 ‘3’
Search PGM231 Table
Matched?
(CO & Tel No)
Summary of Contents for IP LDK-20
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