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Chapter 4      Advanced Router Configuration
Configuring International Phone Support
ring frequency Command
To specify the ring frequency for a specified FXS voice port, use the ring frequency command in 
voice-port configuration mode. Use the no form of this command to restore the default value for this 
command.
ring frequency frequency
no ring frequency
To select the ring frequency, use the commands as follows.
impedance Command
To specify the terminating impedance of a voice port interface, use the impedance command in 
voice-port configuration mode. Use the no form of this command to restore the default value.
impedance {600c | 600r | 900c | 900r | complex1 | complex2 }
no impedance {600c | 600r | 900c | 900r | complex1 | complex2 }
The following table shows what each code specifies.
When using the impedance command, be aware of the following constraints: 
The c600r option selects the current POTS line type 0 implementation. 
The 900r option selects the current POTS line type 1 implementation. 
The 600c, 900c, complex1, and complex2 options select the current POTS line type 2 
implementation.
Configuring International Caller ID
Caller ID (CLID) is an analog service that displays the number of the calling line to the receiving line’s 
terminal device when it receives a call. In some countries, CLID is called Calling Line Identity 
Presentation (CLIP). The Cisco router receives CLID data as a part of the H.225 Setup Message and 
transmits it to the terminal device, which can either be a CLID device or a telephone capable of showing 
CLID messages. 25Specify a 25-Hz ring frequency.
50Specify a 50-Hz ring frequency.
Code Impedance
600c 600-ohm complex
600r 600-ohm real
900c 900-ohm complex
900r 900-ohm real
complex1 complex 1
complex2 complex 2 
						

							  
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Configuring International Phone Support
There are two types of CLID: Type I and Type II. Type I transmits the CLID information when the 
receiving phone is on hook. Type II transmits the CLID information when the receiving phone is off 
hook. Only type I CLID is supported in this release. 
caller-id enable Command
To allow the sending of caller ID information to the FXS voice port, use the caller-id enable voice-port 
configuration command. To disable the sending of caller ID information, use the no form of this 
command, which also clears all other caller ID configuration settings for the voice port.
caller-id enable
no caller-id enable
The country code specified in the cptone command must represent one of the countries for which caller 
ID is supported. Caller ID is disabled by default.
caller-id alerting Command
Specify the caller ID alerting method and enable caller ID support by using the caller-id alerting 
voice-port configuration command. The no form of this command sets the caller ID alerting type to caller 
ID alerting ring type 1.
caller-id alerting { line-reversal | pre-ring | ring < 1 | 2 > }
no caller-id alerting { line-reversal | pre-ring | ring < 1 | 2 > }
Alerting methods are described in the following table.
The default alerting method is ring 1. If the country in which the router is installed uses a different 
alerting method, the appropriate alerting method must be configured. The caller-id alerting ring 
command can be used in countries using the BellCore/Telcordia standard. The caller-id alerting 
line-reversal, the caller-id alerting pre-ring, and caller-id alerting ring commands can be used in 
countries that do not use the BellCore/Telcordia standard.
The caller-id alerting command automatically enables caller ID support for the specific voice port. Alerting Method Description
line-reversalUse line-reversal alerting method. 
pre-ringSet a 250-millisecond pre-ring alerting method for caller ID 
information for on-hook (Type 1) caller ID at an FXS voice 
port. 
ring < 1 | 2 >Set the ring-cycle method for receiving caller ID 
information for on-hook (Type 1) caller ID at an FXS voice 
port. 
1–If your telephone service provider specifies it, use this 
setting to provide caller ID alerting (display) after the first 
ring at the receiving station. 
2–If your telephone service provider specifies it, use this 
setting to provide caller ID alerting (display) after the 
second ring. 
						

							  
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Chapter 4      Advanced Router Configuration
Configuring Committed Access Rate
caller-id block Command
To request the blocking of the display of caller ID information at the far end of a call for calls originated 
at an FXS port, use the caller-id block voice-port configuration command at the originating Foreign 
FXS voice port. To allow the display of caller ID information, use the no form of this command.
caller-id block
no caller-id block
The default is no blocking of caller ID information.
NoteThe calling party information is included in the routed on-net call, as this information is often 
required for other purposes, such as billing and call blocking. The request to block display of the 
calling party information on terminating FXS ports is normally accepted by Cisco routers, but no 
guarantee can be made regarding the acceptance of the request by other equipment.
Configuring Committed Access Rate 
This feature is available on the following Cisco routers:
Cisco 826 and 836
Cisco 827, 827H, 827-4V, 831, and 837
Cisco 828
Use the committed access rate (CAR) to limit bandwidth transmission rates to traffic sources and 
destinations and to specify policies for handling traffic that breaches the specified bandwidth allocations. 
To enable CAR, enter the rate-limit command while in ATM interface configuration mode.
Configuration Example
The following example shows a CAR configuration:
interface ATM0.1 point-to-point
 mtu 576
 ip address 10.0.0.10 255.255.255.0
 rate-limit output 368000 2000 2000 conform-action set-dscp-transmit 40 exceed-action 
set-dscp-transmit 48
 pvc 0/33 
  protocol ip 10.0.0.9 broadcast
  vbr-nrt 142 142 1
  encapsulation aal5snap
 !
Configuring VPN IPSec Support Through NAT
This feature is available on the following Cisco routers:
Cisco 826 and Cisco 836
Cisco 827, Cisco 827H, Cisco 827-4V, Cisco 831, and Cisco 837 
						

							  
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Chapter 4      Advanced Router Configuration
Configuring VPN IPSec Support Through NAT
Cisco 828 
Cisco SOHO 77, Cisco SOHO 78, Cisco SOHO 96, and Cisco SOHO 97 
Cisco IOS Release 12.2(2)XI NAT supports IP Security (IPSec) client software that does not use 
Transmission Control Protocol (TCP) wrapping or User Datagram Protocol (UDP) wrapping. On Cisco 
routers, this feature allows the simultaneous use of multiple, PC-based IPSec clients on which IPSec packet 
wrapping is disabled or is not supported. When PCs connected to the router create an IPSec tunnel, network 
address translation (NAT) on the router translates the private IP addresses in these packets to public IP 
addresses. This NAT feature also supports multiple Point-to-Point Tunnel Protocol (PPTP) sessions, which 
may be initiated by PCs with PPTP client software.
You must enter the following command in global configuration mode for this feature to work:
ip nat inside source list number interface BVI number overload
NAT Default Inside Server Enhancement
This feature is supported on the following Cisco routers:
Cisco 831, Cisco 836, and Cisco 837
Cisco SOHO 91, Cisco SOHO 96, and Cisco SOHO 97
The NAT command has been extended to allow you to specify an inside local address to receive packets 
that do not match criteria in other NAT statements in the configuration. 
The syntax is as follows:
ip nat inside source static inside_local interface interface_name
Configuration Example
Several NAT statements direct traffic to the address 20.0.0.14. All packets not matching those NAT 
statements will be routed to 20.0.0.16.
Current configuration :942 bytes
!
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname c836-1
!
ip subnet-zero
!
ip ssh time-out 120
ip ssh authentication-retries 3
!
crypto mib ipsec flowmib history tunnel size 200
crypto mib ipsec flowmib history failure size 200
!
interface Ethernet0
 ip address 20.0.0.1 255.0.0.0
 ip nat inside
 hold-queue 100 out
!
interface Ethernet1
 ip address 10.0.0.1 255.0.0.0  
						

							  
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Chapter 4      Advanced Router Configuration
Configuring VoAAL2 ATM Forum Profile 9 Support
 ip nat outside
!
ip nat inside source static tcp 20.0.0.14 80 interface Ethernet1 80
ip nat inside source static udp 20.0.0.14 161 interface Ethernet1 161
!
ip nat inside source static 20.0.0.16 interface Ethernet1
! 20.0.0.16 is defined as the catch-all address
!
ip nat inside source static udp 20.0.0.14 1000 interface Ethernet1 1000
! udp port 1000 traffic will be routed to 20.0.0.14
!
ip nat inside source static tcp 20.0.0.14 23 interface Ethernet1 23
! telnet traffic will be routed to 20.0.0.14
!
ip classless
no ip http server
!
!
line con 0
 stopbits 1
line vty 0 4
 password lab
 login
Configuring VoAAL2 ATM Forum Profile 9 Support
The Cisco 827-4V router supports voice over ATM Adaptation Layer 2 (VoAAL2) ATM Forum 
Profile 9. ATM Forum Profile 9 supports a 44-byte payload, optimizing voice transport efficiency, and 
makes interoperability with TdSoft gateways possible.
This feature enables the Cisco router to interoperate with GR.303 and V5.2 gateways that communicate 
with Class 5 switches. The voice PVC is routed to a VoAAL2 gateway that supports either the General 
Recommendation 303 (GR.303) or the V5.2 protocol. This gateway converts the AAL2-encoded voice 
cells to a format that can be sent over a time division multiplexed connection to a Class 5 switch. The 
data PVC can be routed through the digital subscriber line access multiplexer (DSLAM) or aggregator 
to the data network.
Configuring ATM Forum Profile 9
Follow these steps to configure ATM Forum Profile 9 support for a voice port, beginning in global 
configuration mode.
Step 1Enter the voice class permanent 1 command to configure a voice class.
Step 2Enter the signal timing oos timeout disabled command to disable the assertion of the receive 
Out-of-Service (OOS) pattern to the PBX when signaling packets are lost.
Step 3Enter exit to exit voice class configuration mode.
Step 4Enter voice service voatm to enter voice service configuration mode.
Step 5Enter the session protocol aal2 command.
Step 6Enter mode bles to indicate that VOATM is to be used in broadband loop emulation service (BLES) 
mode. 
						

							  
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Configuring VoAAL2 ATM Forum Profile 9 Support
Step 7Enter exit to leave session protocol mode, and then enter exit again to leave voice service configuration 
mode.
Step 8Enter interface atm0 to enter ATM 0 interface configuration mode.
Step 9Enter pvc vpi vci to specify the virtual path identifier and the virtual channel identifier of the PVC.
Step 10Enter vbr-rt pcr acr bcs to specify the variable bit rate-real time peak cell rate and average cell rate in 
kbps, and the burst cell size in number of cells.
NoteOne phone line requires a minimum setting of 78 kbps for both PCR and ACR values. 
Step 11Enter encapsulation aal2 to specify that ATM adaptation layer 2 type encapsulation be used.
Step 12Enter no atm cell-clumping-disable to ensure that sufficient bandwidth is allocated for data packets 
when voice calls are in progress.
Step 13Enter exit to leave ATM 0 interface configuration mode.
Step 14Enter the dial-peer voice tag voatm command. This command places the router in dial-peer voice 
configuration mode.
Step 15Enter the session protocol aal2-trunk command.
Step 16Enter the session target atm0 pvc vpi/vci cid cid command.
This command has the following parameters: 
vpi—Virtual path identifier
vci—Virtual channel identifier
cid—AAL2 channel identifier
Step 17To specify which codec profile the voice dial peer will use, enter one of these codec aal2 profile 
commands, as appropriate:
Enter codec aal2-profile atmf 9 g711alaw to specify that only G.711 a-law be used.
Enter codec aal2-profile atmf 9 g711ulaw to specify that only G.711 mu-law be used.
Step 18Enter the destination-pattern destination string command. The destination string is the phone number 
in E.164 format that must match the destination string configured for the voice-port in order to 
associate a dial-peer with a voice port.
Step 19Enter the voice-class permanent 1 command to associate this dial peer with the configured voice class.
Step 20Enter no vad to specify no voice activity detection (VAD).
Step 21Enter exit to leave dial peer voice configuration mode.
Step 22Enter the voice port # command to enter voice port configuration mode.
Step 23Enter the connection trunk destination-pattern command. The destination pattern must match the 
destination-string configured for the dial peer.
Step 24Enter the playout-delay mode fixed no-timestamps command. This command causes the AAL2 
packet to be played at a fixed rate, and the timestamps carried in the packet to be ignored.
Step 25Enter end to exit router configuration mode. 
						

							  
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Chapter 4      Advanced Router Configuration
Configuring ATM OAM F5 Continuity Check Support
Configuration Example
The following example shows the configuration for two voice ports using Profile 9, and the G.711 a-law 
codec. VBR-RT, PCR, and ACR values are 312 to accommodate 4 phone lines, although only 2 phone 
lines are currently configured.
voice service voatm
 !
 session protocol aal2
  mode bles
!
!
voice class permanent 1
 signal timing oos timeout disabled
!
interface atm 0
 no atm cell-clumping-disable
 pvc 1/100
 vbr-rt 312 312 32
 encapsulation aal2
!
voice-port 1
 playout-delay mode fixed no-timestamps
 cptone DK
 timeouts wait-release 3
 connection trunk 8881052
 caller-id enable
 !
voice-port 2
 playout-delay mode fixed no-timestamps
 cptone DK
 timeouts wait-release 3
 connection trunk 8881053
 caller-id enable
!
!dial-peer voice 1000 voatm
 destination-pattern 8881052
 voice-class permanent 1
 session protocol aal2-trunk
 session target ATM0 pvc 1/100 16
 codec aal2-profile ATMF 9 g711alaw
 no vad
!
dial-peer voice 1001 voatm
 destination-pattern 8881053
 voice-class permanent 1
 session protocol aal2-trunk
 session target ATM0 pvc 1/100 17
 codec aal2-profile ATMF 9 g711alaw
 no vad
!
Configuring ATM OAM F5 Continuity Check Support
This feature is available on the following Cisco routers:
Cisco 826 and Cisco 836
Cisco 827, Cisco 827H, and Cisco 837
Cisco SOHO 77, Cisco SOHO 96, and Cisco SOHO 97 
						

							  
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Chapter 4      Advanced Router Configuration
Configuring ATM OAM F5 Continuity Check Support
ATM operation administration and maintenance (OAM) F5 continuity check (CC) cells enable network 
administrators to detect misconfigurations in the ATM layer. Such misconfigurations can cause 
misdelivery of a cell stream to a third party or can cause unintended merging of cells from multiple 
sources.
CC cells provide an in-service tool optimized to detect connectivity problems at the ATM layer. CC cells 
are sent between a router designated as the source location and a router designated as the sink location. 
The local router can be configured as the source, as the sink, or as both the source and the sink. It is not 
necessary to enter a CC configuration on the router at the other end of the segment, because the router 
on which CC has been configured sends a CC activation request to the router at the other end of the 
segment, directing it to act as either a source or a sink.
oam-pvc manage cc Command
The oam-pvc manage cc command configures continuity checking on a PVC. Use the no form of this 
command to disable continuity checking on the segment.
oam-pvc manage cc segment direction [ source | sink | both ]
no oam-pvc manage cc segment direction [ source | sink | both ]
Syntax Description
segment direction specifies the CC cell transmission direction.
Default
The default segment direction is sink.
Command Mode
PVC configuration mode.
Message Guidelines
Using no oam-pvc manage cc deactivates continuity checking regardless of the direction in which it is 
being performed, and regardless of which router initiated continuity checking.
Configuration Examples
The following configuration activates CC over the segment and causes the router to function as the 
source.
interface ATM0
 ip address 10.0.0.3 255.255.255.0
 pvc 0/33 
  oam-pvc manage cc segment direction source
 !
 end
sourceThe router is to act as the source of CC cells.
sinkThe router is to act as the sink, or destination, for transmitted CC 
cells.
bothThe router is to act as both source and sink. 
						

							  
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Chapter 4      Advanced Router Configuration
Configuring ATM OAM F5 Continuity Check Support
The following configuration activates CC over the segment and causes the router to function as the sink.
interface ATM0
 ip address 10.0.0.3 255.255.255.0
 pvc 0/33 
  oam-pvc manage cc segment direction sink
 !
 end
The following configuration activates CC over the segment and causes the router to function both as the 
source of CC cells and as the sink:
interface ATM0
 ip address 10.0.0.3 255.255.255.0
 pvc 0/33 
  oam-pvc manage cc segment direction both
 !
 end
The following configuration deactivates segment CC:
interface ATM0
 ip address 10.0.0.3 255.255.255.0
 pvc 0/33 
    no oam-pvc manage cc
!
end
oam retry cc activation-count deactivation-count retry-frequency Command
The oam retry cc activation-count deactivation-count retry-frequency command sets the frequency 
at which CC activation and deactivation requests are sent to the router at the other end of the segment. 
The no form of this command removes these settings.
oam retry cc activation-count number deactivation-count number retry-frequency seconds
no oam retry cc activation-count number deactivation-count number retry-frequency seconds
Syntax Description
Default
No default.
Command Mode
PVC configuration.activation-countSpecifies the maximum number of times the activation 
message will be sent before receiving an acknowledgement.
deactivation-cou
ntSpecifies the maximum number of times the deactivation 
message will be sent before receiving an acknowledgement.
retry-frequencySpecifies the interval between retries. 
						

							  
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Chapter 4      Advanced Router Configuration
Configuring ATM OAM F5 Continuity Check Support
Example Configuration
The following configuration sets the CC activation and deactivation counts, as well as the retry 
frequency:
interface ATM0
 ip address 10.0.0.3 255.255.255.0
 pvc 0/33 
  oam-pvc manage cc segment direction source
  retry activation-count 10 deactivation-count 10 retry-frequency 3
 !
 end
oam-pvc manage cc deny Command
The oam-pvc manage cc deny command disables CC support on the virtual circuit (VC) under which 
the command has been entered. A PVC on which CC support has been disabled will deny CC activation 
requests. The no form of this command reenables CC support on the VC.
oam-pvc manage cc deny
no oam-pvc manage cc deny
Default
CC is supported by default.
Command Mode
PVC configuration mode.
Example Configuration
The following configuration denies segment CC:
interface ATM0
 ip address 10.0.0.3 255.255.255.0
 pvc 0/33 
    oam-pvc manage cc deny
 !
 end
debug atm oam cc Command
You see the results of continuity checking by using the debug atm oam cc command. The no form of 
this command disables continuity checking debugging.
debug atm oam cc interface atm number 
no debug atm oam cc interface atm number 
Syntax Description
Default
Disabled.numberATM interface number.