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190 CHAPTER 15: CONFIGURING ISDN PROTOCOL
■ Set the called number or sub-address to be checked in digital incoming call
1 Configure ISDN Signaling Type
Perform the following configurations in either system view or interface view.
Table 220 Configure type of signaling on ISDN interface
By default, DSS1 signaling is used on ISDN PRI interfaces.
The isdn protocol-type command can take effect only on ISDN PRI interfaces.
For an ISDN BRI interface, it does not take effect. In other words, an ISDN BRI
interface can use only DSS1 signaling, whereas an ISDN PRI interface can use
either DSS1 signaling or QSIG signaling.
Using the isdn protocol-type command in system view will not affect the
existing ISDN PRI interface, and it will only change the default type of signaling on
the newly created ISDN PRI interface.
2 Configure the QSIG Signaling Parameters
If QSIG signaling is used on an ISDN PRI interface, you can configure the QSIG
signaling parameters.
The following configuration commands can be used only
when the ISDN PRI interface adopts QSIG signaling.
a Length of call reference
Call reference is the flag used to distinguish the communication entities. A call
reference uniquely identifies a call.
Perform the following configurations in interface view.
Table 221 Configure the length of call reference
By default, the length of call reference is two bytes.
b Mode in which a called number is received
A router can receive called numbers in two modes: overlap receiving and
complete receiving.
You can set the receiving mode on the router according to
the transmitting mode on the peer.
Perform the following configurations in interface view.
Table 222 Configure the receiving mode
By default, ISDN PRI interfaces receive called numbers in overlap receiving
mode.
c Mode in which a called number is sent
Operation Command
Set ISDN signaling to QSIG isdn protocol-type qsig
Set ISDN signaling to DSS1 (Digital Subscriber
Signaling No.1)
isdn protocol-type dss1-
Operation Command
Set the length of call reference to 1 byte isdn crlength 1
Set the length of call reference to 2 bytes isdn crlength 2
Operation Command
Overlap receiving mode is used. isdn overlap-receiving
Complete receiving mode is used. undo isdn overlap-receiving