CiSCo 3640 with T1 CAS
　　acc-3640-6a#show running-config
　　Building configuration...
　　
　　Current configuration : 1137 bytes
　　!
　　version 12.1
　　no service single-slot-reload-enable
　　service timestamps debug uptime
　　service timestamps log uptime
　　no service password-encryption
　　service internal
　　!
　　hostname acc-3640-6a
　　!
　　logging rate-limit console 10 except errors
　　!
　　username dialin password 0 user
　　! -- Usernames for local authentication of the call.
　　! -- The clIEnt presents the username/password and the NAS
　　! -- authenticates the peer. To use AAA with RADIUS or TACACS+, refer to
　　! -- the document Implementing the Server-Based AAA Subsystem.
　　ip subnet-zero
　　!
　　no ip finger
　　no ip domain-lookup
　　!
　　async-bootp dns-server 10.98.1.220
　　! -- Specifies (for async clIEnts) the IP address of domain name server.
　　async-bootp nbns-server 10.98.1.221
　　! -- Specifies (for async clIEnts) the IP address of WINS server.
　　call rsvp-sync
　　!
　　controller T1 0/0
　　! -- T1 Physical interface controller configuration.
　　! -- Interfaces are addressed as controller slot/port.
　　! -- In this example, the NM-1CT1-CSU module is in slot 0.
　　framing esf
　　! -- Framing for this T1 is Extended Super Frame (ESF).
　　! -- Obtain this information from the telco.
　　linecode b8zs
　　! -- Linecoding for this T1. Obtain this information from the telco.
　　ds0-group 0 timeslots 1-24 type e&m-immediate-start
　　! -- CAS T1 with E&M Immediate Start provided by telco.
　　! -- Verify your signaling type with your local provider. Prior to CiSCo IOS
　　! -- Software Release 12.0(5)T, this command was known as cas-group.
　　!
　　interface Ethernet2/0
　　ip address 10.98.1.51 255.255.255.0
　　half-duplex
　　!
　　interface Group-Async1
　　! -- This group-async interface is the configuration template for all modems.
　　! -- Individual async interface do not have to be configured since they
　　! -- can be cloned from one managed copy.
　　ip unnumbered Ethernet2/0
　　encapsulation ppp
　　dialer in-band
　　dialer-group 1
　　!--- Apply interesting traffic definition from dialer-list 1.
　　! -- Note: The specifIEd dialer-group number must be the same as
　　! -- the dialer-list number; in this example, defined to be "1".
　　! -- Interesting traffic specifIEs the packets that should reset the idle timer.
　　dialer idle-timeout 600
　　! -- Sets Idle timer to 600 seconds (10 minutes).
　　async mode dedicated
　　! -- Allows only PPP dialup. PrEVEnts users from establishing
　　! -- an "EXEC session" to the router. If the async interface is to answer
　　! -- different connection types (exec,ppp,slip etc),
　　! -- use async mode interactive in conjunction with autoselect ppp
　　! -- under the line configuration to auto detect the connection type.
　　peer default ip address pool dialin
　　! -- ClIEnts are assigned addresses from the ip address pool named "dialin".
　　ppp authentication chap pap
　　group-range 33 56
　　! -- Modems 33 through 56 are members of this group async interface.
　　! -- This range was determined in the section Pre-configuration Tasks.
　　!
　　ip local pool dialin 10.98.1.15 10.98.1.39
　　! -- IP address pool for dialin clIEnts.
　　ip classless
　　ip route 0.0.0.0 0.0.0.0 10.98.1.1
　　no ip http server
　　!
　　dialer-list 1 protocol ip permit
　　! -- SpecifIEs all IP traffic as interesting. Interesting traffic
　　! -- specifIEs the packets that should reset the idle timer.
　　! -- This is applIEd to interface Group-Async 1 using dialer-group 1.
　　! -- Note: The specifIEd dialer-list number must be the same as the
　　! -- dialer-group number; in this example, defined to be "1".
　　!
　　dial-peer cor custom
　　!
　　line con 0
　　transport input none
　　line 33 56
　　! -- TTY lines for the NM-24DM Modems.
　　! -- This line range was determined in the section Pre-configuration Tasks.
　　modem InOut
　　! -- Support incoming and outgoing modem calls.
　　transport input all
　　line aux 0
　　line vty 0 4
　　login
　　!
　　end