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You can configure transparent CCS in one of two ways: CCS cross-connect (or TDM cross-connect, which implies a fractional trunk), or CCS frame-forwarding. The configuration procedures are described in the "Configuration Tasks" section.
This feature provides the following benefits:
This feature is supported only on the Cisco MC3810.
None.
The configuration procedures are divided into the following sections:
This section is divided into the following procedures:
Figure 1 shows an example of CCS cross-connect. In this example, the CCS channel from the PBX is cross-connected on the Cisco MC3810 to a timeslot on the T1/E1 controller. The channel is then passed through the WAN as a leased line to the second Cisco MC3810, where it is cross-connected to the digital voice module (DVM) signaling timeslot (timeslot 24 for T1, or timeslot 16 for E1). The channel is then passed to the second PBX. The CCS signal byte stream is transparently passed transparently by the Cisco MC3810.
| Step | Command | Purpose |
|---|---|---|
1 | controller T1 0 | Enter controller configuration mode for controller T1 0. |
2 | tdm-group tdm-group-no timeslot timeslot-list | Configure a TDM channel group for controller T1 0. Do not specify the type option in the command. |
3 | controller T1 1 | Enter controller configuration mode for controller T1 1. |
4 | mode ccs cross-connect | Configure CCS cross-connect for controller T1 1. |
5 | tdm-group tdm-group-no timeslot timeslot-list | Configure a TDM channel group for controller T1 1. Do not specify the type option in the command. |
6 | cross-connect id controller-1 tdm-group-no-1 controller-2 tdm-group-no-2 | Configure cross-connect pass-through between the two controllers. |
To configure CCS cross-connect for E1, complete the following steps beginning in global configuration mode:
| Step | Command | Purpose |
|---|---|---|
1 | controller E1 0 | Enter controller configuration mode for controller E1 0. |
2 | tdm-group tdm-group-no timeslot timeslot-list | Configure a TDM channel group for E1. Do not specify the type option in the command. |
3 | controller E1 1 | Enter controller configuration mode for controller E1 1. |
4 | mode ccs cross-connect | |
5 | voice-group channel-no timeslots timeslot-list type [ext-sig-master | ext-sig-slave] | Configure the specified channel to support CCS mode, and specify whether the T1/E1 trunk will be the external signaling master or slave. A channel configured as ext-sig-master automatically generates the off-hook signal and stays in the off-hook state. A channel configured as ext-sig-slave automatically generates the answer signal when a call is terminated to that channel. These type options are available only when the mode ccs cross-connect command is enabled. |
6 | cross-connect id controller-1 tdm-group-no-1 controller-2 tdm-group-no-2 | Configure cross-connect pass-through between the two controllers. |
If you will use CCS cross-connect for bearer channels of the T1/E1 trunk, you must perform the following additional configuration beginning in global configuration mode:
| Step | Command | Purpose |
|---|---|---|
1 | controller {T1 | E1} number | Enter controller configuration mode for the controller. |
2 | mode ccs cross-connect | Specify the controller to support CCS cross-connect. |
3 | voice-group channel-no timeslots timeslot-list type [ext-sig-master | ext-sig-slave] | Configure the specified channel to support CCS mode, and specify whether the T1/E1 trunk will be the external signaling master or slave. A channel configured as ext-sig-master automatically generates the off-hook signal and stays in the off-hook state. A channel configured as ext-sig-slave automatically generates the answer signal when a call is terminated to that channel. These type options are available only when the mode ccs cross-connect command is enabled. |
4 | voice-port slot/port | Enter voice-port configuration mode. For digital voice ports, the slot number is 1 for this configuration. Valid numbers for port are from 1 to 24 for T1, and from 1 to 15 and from 17 to 31 for E1. |
5 | connection plar string | Configure the voice-port connection to support Private Line Auto Ringdown (PLAR) mode. For the string, enter the number of the voice channel that was configured as the ext-sig-slave for the voice-group command. Note After a transparent CCS connection is configured by entering the connection plar command, any change to the configuration will not take place until the connection is shut down with a shutdown command and then restarted with a no shutdown command. For example, the phone number supplied in the connection plar command can be changed while the connection is in no shutdown state, but the change will not cause the current connection to be closed and a new connection to be opened to the new phone number. This will only take effect on the next no shutdown command following a shutdown command. |
The voice channel type configured as the ext-sig-master is considered the master side of the permanent virtual circuit (PVC) connection and is responsible for establishing the PVC connection. After the master channel is configured, a fixed timer of 30 seconds starts. The voice-signaling driver then generates an off-hook signal on the master voice channel after the timer expires. The call is treated as a regular call, and the master voice channel will not hang up after the connection is made. If the call does not go through, or if the T1/E1 trunk is down, the 30-second timer on the master channel side restarts. A new off-hook signal is then generated at the master channel side after the timer expires.
With CCS frame-forwarding, the connection between PTNXs over the network must be point-to-point and preconfigured. With the CCS frame-forwarding implementation, calls from the PTNXs are not routed, but follow a preconfigured route to the destination.
Figure 2 shows an example of CCS frame-forwarding. In the example, the Cisco MC3810 captures the signaling frame from the PBX. The Cisco MC3810 then transports the signaling frame as a data frame through the Frame Relay or ATM network to the second Cisco MC3810. The second Cisco MC3810 then forwards the signaling frame to the PBX signaling channel.
To configure CCS frame-forwarding, complete the following steps beginning in global configuration mode:
| Step | Command | Purpose |
|---|---|---|
1 | controller {T1 | E1} 1 | Enter controller configuration mode. CCS frame-forwarding is only available on controller T1/E1 1. |
2 | mode ccs frame-forwarding | Specify the controller to support CCS transparent signaling. |
3 | voice-group channel-no timeslots timeslot-list type [ext-sig-master | ext-sig-slave] | Configure the specified channel to support CCS mode, and specify whether the T1/E1 trunk will be the external signaling master or slave. A channel configured as ext-sig-master automatically generates the off-hook signal and stays in the off-hook state. A channel configured as ext-sig-slave automatically generates the answer signal when a call is terminated to that channel. These type options are available only when the mode ccs frame-forwarding command is enabled. |
4 | voice-port slot/port | Enter voice-port configuration mode. For digital voice ports, the slot number is always 1. Valid numbers for port are from 1 to 24 for T1, and from 1 to 15 and from 17 to 31 for E1. |
5 | connection plar string | If the voice port in the voice group is configured as the ext-sig-master, configure the voice-port connection to support PLAR mode for bearer channels. For the string, enter the number of the voice channel that was configured as the ext-sig-master for the voice-group command. If the voice port in the voice group is configured as the ext-sig-slave, the dial peer should just terminate the PLAR calls. Note After a transparent CCS connection is configured by entering the connection plar command, any change to the configuration will not take place until the connection is shut down with a shutdown command and then restarted with a no shutdown command.For example, the phone number supplied in the connection plar command can be changed while the connection is in no shutdown state, but the change will not cause the current connection to be closed and a new connection to be opened to the new phone number. This will only take effect on the next no shutdown command following a shutdown command. |
6 | interface serial 1:x | Enter interface mode for serial 1:x where x represents the channel number. For E1, enter 15. For T1, enter 23. This procedure maps the D channel from the DVM to the specified interface. |
7 | ccs connect {serial |atm} number [dlci dlci| pvc vci | pvc vcd | pvc vpi/vci | pvc string] | |
8 | no cdp enable | Disable Cisco Discovery Protocol (CDP) on the interface. |
9 | no keepalive | Disable keepalive packets on the interface. |
The following configuration example configures CCS frame-forwarding on controller E1. Other commands necessary for the configuration are included.
!
version 12.0 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname c3810a ! logging buffered 4096 debugging ! network-clock base-rate 56k ip subnet-zero no ip domain-lookup ip host rb 10.1.1.1 ! ! ! stun peer-name 10.1.1.1 stun protocol-group 1 basic ! controller E1 1 framing NO-CRC4 Australia clock source internal mode ccs frame-forwarding voice-group 1 timeslots 1-2 type ext-sig-master ! ! ! interface Ethernet0 ip address 144.254.156.169 255.255.255.0 no ip directed-broadcast no ip route-cache no ip mroute-cache no keepalive ! interface Serial0 ip address 10.1.1.2 255.255.255.0 no ip directed-broadcast encapsulation frame-relay no ip route-cache no ip mroute-cache no arp frame-relay bandwidth 256 no keepalive no fair-queue serial restart-delay 0 frame-relay interface-dlci 30 voice-encap 80 hold-queue 1024 out ! interface Serial1 no ip address no ip directed-broadcast encapsulation stun no ip route-cache no ip mroute-cache stun group 1 stun route all interface Serial0 dlci 30 ! interface Serial1:15 no ip address no ip directed-broadcast ccs connect Serial0 30 ! interface Switch0 no ip address no ip directed-broadcast encapsulation frame-relay no fair-queue ! interface FR-ATM0 no ip address no ip directed-broadcast ! interface FR-ATM20 no ip address no ip directed-broadcast no ip route-cache shutdown ! router rip network 10.0.0.0 network 144.254.0.0 ! ip classless ! ! map-list atm1 ! map-class frame-relay A-relay frame-relay traffic-rate 256000 1540000 no frame-relay adaptive-shaping ! ! line con 0 transport input none line aux 0 line 2 3 line vty 0 4 password cisco login ! ! voice-port 1/1 vad connection plar 1 ! voice-port 1/2 vad connection plar 2 ! dial-peer voice 1 vofr destination-pattern 1 session target Serial0 30 ! dial-peer voice 2 vofr destination-pattern 2 session target Serial0 30 ! end
The following new or modified commands are used to configure the transparent CCS and CCS frame forwarding features:
To configure a CCS connection on an interface configured to support CCS frame forwarding, use the ccs connect interface configuration command. To disable the CCS connection on the interface, use the no form of this command.
ccs connect {serial | atm} number [dlci dlci | pvc vci | pvc vcd | pvc vpi/vci | pvc string]
serial | Make a serial CCS connection. |
atm | Make an ATM CCS connection. |
number | Specifies the connection number. Choose one of the following options: |
dlci dlci | Specifies the DLCI number. |
pvc vci | Specifies the PVC virtual circuit identifier. |
pvc vcd | Specifies the PVC virtual circuit descriptor. |
pvc vpi/vci | Specifies the PVC virtual path identifier/virtual channel identifier. |
pvc string | Specifies the PVC string. |
No CCS connection is made.
Controller configuration mode
This command first appeared in Cisco IOS Release 12.0(1)XA.
To configure a CCS frame-forwarding connection on DLCI 100, enter the following command:
ccs connect serial 1 dlci 100
To configure a CCS frame-forwarding connection over an ATM PVC, enter the following command:
ccs connect atm0 pvc 100
mode ccs
To configure the T1/E1 controller to support CCS cross-connect or CCS frame-forwarding, use the mode ccs controller configuration command. To disable support for CCS cross-connect or CCS frame-forwarding on the controller, use the no form of this command.
mode ccs {cross-connect | frame-forwarding}
cross-connect | Enables CCS cross-connect on the controller. |
frame-forwarding | Enables CCS frame forwarding on the controller. |
No CCS mode is configured.
Controller configuration mode
This command first appeared in Cisco IOS Release 12.0(1)XA.
To enable CCS cross-connect on controller T1 1, enter the following commands:
controller T1 1 mode ccs cross-connect
To enable CCS frame-forwarding on controller T1 1, enter the following commands:
controller T1 1 mode ccs frame-forwarding
ccs connect
channel-no | Channel number to identify the CAS group. The valid range is from 0 to 23. |
timeslot list | A list of timeslots which comprise the CAS group. The valid range is from 1-24 for T1, and from 1-15 and 17-31 for E1. |
type | The type of voice interface. Choose one of the following type options: |
The following type options are available if the mode cas command is enabled: | |
e&m-immediate | E&M immediate. |
e&m-delay | E&M delay. |
e&m wink | E&M wink. |
e&m melcas | E&M Mercury Exchange Limited (MEL) Channel Associated Signaling (CAS) |
fxs-ground-start | Foreign Exchange Station ground-start. |
fxs-loop-start | Foreign Exchange Station loop start. |
fxs-melcas | Foreign Exchange Station Mercury Exchange Limited (MEL) Channel Associated Signaling. |
fxo-ground-start | Foreign Exchange Office ground start. |
fxo-loop-start | Foreign Exchange Office loop start. |
fxo-melcas | Foreign Exchange Office Mercury Exchange Limited (MEL) Channel Associated Signaling. |
The following type options are available only if the mode ccs command is enabled. | |
ext-sig-master | Specifies the channel to automatically generate the off-hook signal and stay in the off-hook state. |
ext-sig-slave | Specifies the channel to automatically generate the answer signal when a call is terminated to that channel. |
None.
Controller configuration mode
This command first appeared in Cisco IOS Release 11.3 MA.
The ext-sig-master and ext-sig-slave options were added in Cisco IOS Release 12.0(1)XA.
You can use the master indexes or search online to find documentation of related commands.
channel-group
mode
tdm-group
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