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• Payer change—This is useful for saving cost in the case that the call rates in two directions are
different.
• Consolidated call charge bills—Facilitating settlement.
PPP callback and ISDN caller identification callback features are available. The PPP callback
conforms to RFC 1570 specifications and can be used where both client and server own fixed
network addresses, or the client accepts dynamic network address assignment.
Configuration prerequisites
Before you configure DCC, complete the following configurations:
• Identifying the topology of DCC application
• Making preparatory configuration
• Configuring DCC parameters
Identifying the topology of DCC application
Identify the following:
• Which routers will provide DCC and how they are related to each other.
• Which interfaces on the routers will provide DCC, and which roles they will play.
• Which transmission medium will be used, PSTN or ISDN.
Making preparatory configuration
Before you configure DCC on an interface:
• Identify the interface type (synchronous/asynchronous serial, ISDN BRI or PRI, or AUX) and
configure physical interface parameters.
• On the dialup interface, enable link layer protocol encapsulation, such as PPP.
• Configure the routing protocol, such as RIP or OSPF, for example.
• Configure the network protocol, such as IP.
• Select a DCC approach, C-DCC or RS-DCC.
Configuring DCC parameters
Configure DCC parameters depending on the DCC approach you selected for basic DCC dial
functions. Based on that, you can configure advanced functions such as MP, PPP callback, ISDN
caller identification callback, ISDN leased line, auto-dial, and circular dialer string backup. You can
also tune the attribute values of DCC dialup interfaces depending on link conditions.
DCC configuration task list
Task Remarks
Configuring basic settings for DCC
Required.
Configuring C-DCC
Required.
Configure either C-DCC or RS-DCC
as required.
Configuring RS-DCC
Configuring MP for DCC
Optional.
Configuring PPP callback
Optional.
Configuring ISDN caller identification callback
Optional.
Configuring advanced
Configuring an ISDN leased line
Optional.