700
Item Descri
tion
ISDN Call Reference Length
Set length of the call reference used when a call is placed on an ISDN
interface.
The call reference is equal to the sequence number that the protocol assigns to
each call. It is 1 or 2 bytes in length and can be used cyclically.
When the device receives a call from a remote device, it can automatically
identify the length of the call reference. However, some devices on the
network do not have this capability. In the event that the device is required to
place calls to such a device connected to it, you must configure the device to
use the same call reference length configured on the connected device.
Status
Enable—Enable the BSV interface.
Disable—Disable the BSV interface.
Displaying ISDN link state
Select Voice Management > Digital Link Management from the navigation tree, and then click the name
of the target digital link (taking a VE1 digital link as an example) to access the page displaying the link
state as shown in Figure 722.
Figure 722 Displaying ISDN link stat
e
E1 voice DSS1 signaling configuration example
Network requirements
As shown in Figure 723, Telephones in City A and City B communicate with each other through Router
A and Router B over an IP network.
• Router A is connected to a PBX through an E1 voice subscriber line, and to the telephone at
0101003 through an FXS voice subscriber line.
• Router B is connected only to a PBX through an E1 voice subscriber line.
The two routers communicate with their respective PBX by exchanging DSS1 user signaling through an
ISDN interface. The one-stage dialing mode is configured on the two routers.
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