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Chapter 6      Configuring Telephone Interfaces
Creating Dial Peers
For example, if you have connected one voice device (555-1111) to port 1 and 
another (555-2222) to port 2, you can create two dial peers. The following output 
example shows two dial peers:
dial-peer voice 1 pots 
destination-pattern 5551111
port 1
no call-waiting
ring 0
dial-peer voice 2 pots 
destination-pattern 5552222
port 2
no call-waiting
ring 0
When a caller dials 555-1111, the call is routed to port 1. When a caller dials 
555-2222, the call is routed to port 2. If the dial peers are not created, calls to both 
numbers are routed to port 1.Command Purpose
Step 1dial-peer voice tag potsSet up tag number (1 through 6) for dial 
peer. 
Step 2destination-pattern ldnSpecify local ISDN directory number 
assigned to telephone interface. Do not 
specify an area code.
Step 3port port-numberSpecify number (1 or 2) associated with 
telephone port.
Step 4no call-waitingOptional. Disable call waiting.
Step 5ring cadence-numberOptional. Set up distinctive ring (0 
through 2). For more information, see the 
“Distinctive Ringing” section on 
page 6-11.
Step 6show dial-peer voice [tag] Optional. Display all or a particular 
dial-peer configuration (1 through 6).  
						

							 
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Forwarding Incoming ISDN Voice Calls to Connected Devices
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NoteMake sure that all ISDN directory numbers associated with a service profile 
identifier (SPID) are associated with one port. For example, if both 555-1111 and 
555-2222 are associated with SPID 1 and you associate 555-1111 to port 1 and 
555-2222 to port 2, you will not be able to make calls on ports 1 and 2 
simultaneously.
What You Need to Know About SPIDs
North America uses SPIDs to identify subscribed services. The SPID format is 
generally an ISDN telephone number with several numbers added to it, such as 
40855511110101. Your ISDN line could be assigned zero, one, or two SPIDs.
You must associate a SPID with an ISDN directory number and a telephone port 
number by using the isdn spid1 and isdn spid2 commands in global configuration 
mode and the port command in dial peer configuration mode. Make sure that you 
specify all the ISDN directory numbers provided by your telephone service 
provider in the isdn spid1 and isdn spid2 commands. Also make sure that all 
ISDN directory numbers associated with a SPID are associated with the same 
telephone port. For information on using the port command while setting up a dial 
peer, see the “Creating Dial Peers” section on page 6-4.
Forwarding Incoming ISDN Voice Calls to 
Connected Devices
Starting from global configuration mode, follow these steps:
Command Purpose
Step 1interface bri0Specify parameters for the WAN interface.
Step 2isdn incoming-voice modemSpecify that incoming ISDN voice calls are 
forwarded to devices connected to 
telephone ports. 
						

							 
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Chapter 6      Configuring Telephone Interfaces
Configuring Advanced Telephone Features
NoteIf you do not enter the isdn incoming-voice modem command, the router rejects 
incoming ISDN voice calls.
Configuring Advanced Telephone Features
This section describes advanced telephone features and how to configure them. 
ISDN Voice Priority
The ISDN voice priority feature controls the priority of data and voice calls for 
telephones or fax machines connected to the router telephone ports. If an ISDN 
circuit endpoint is busy with a data call or calls and either a voice call comes in 
(incoming) or you attempt to place a voice call (outgoing), the data call is handled 
per the voice priority setting.
You can configure the router so that data calls are handled in one of the following 
ways:
A voice call always supercedes (“bumps”) a data call. This is the default 
setting.
A voice call supercedes a data call only if there are more than one call to the 
same destination.
A voice call never supercedes a data call.
Use the following command to reconfigure the priority.
If you have multiple ISDN directory numbers associated with a SPID, then the 
outgoing voice priority that you set for any of these directory numbers applies to 
the other numbers. Command Purpose
isdn voice-priority 
local-directory-number 
{in | out} {always | conditional | 
off}Configure ISDN voice priority for each 
ISDN directory number. 
						

							 
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For example, if you enter the following command, the outgoing voice priority for 
all directory numbers specified in the isdn spid1 command is set to conditional:
router(config-if)# isdn spid1 0  4 0 8 5 5 5 1111  4 0 8 5 5 5 2 2 2 2  4 0 8 5 5 53333router(config-if)# isdn voice-priority 5551111 out conditional
Ta b l e 6 - 1 describes the possible data call scenarios, what happens when a voice 
call comes in, and what happens when you place an outgoing voice call with a 
particular configuration. 
The setting of the pots dialing-method command determines whether you hear a 
busy signal if a data call cannot be bumped when you are trying to make an 
outgoing call. If the setting is overlap, you hear a busy signal when you pick up 
the handset. If the setting is enblock, you hear a dial tone initially, then a busy 
signal.
Table 6-1 Incoming and Outgoing ISDN Voice Priority Scenarios
Scenario Always Conditional Off
Two data channels to 
destination A.Bump one data channel 
when you pick up 
handset to answer 
incoming voice call or 
to place outgoing voice 
call.Bump one data channel 
when you pick up 
handset to answer 
incoming voice call or 
to place outgoing voice 
call.No bump; voice caller 
receives busy signal.
One data channel to 
destination A; 
one data channel to 
destination B.Bump one data channel 
when you pick up 
handset to answer 
incoming voice call or 
to place outgoing voice 
call.No bump; voice caller 
receives busy signal.No bump; voice caller 
receives busy signal. 
						

							 
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Chapter 6      Configuring Telephone Interfaces
Configuring Advanced Telephone Features
Data over Voice Bearer Service
NoteThis section applies only to analog telephone services in the U.S.
In some tariff areas, voice calls are less expensive than data calls. If this is the 
case in your tariff area, the Cisco 800 series routers support incoming and 
outgoing data over voice (DOV) calls. DOV calls are data calls made over the 
ISDN line using voice bearer capability (VBC).
The router recognizes the difference between a data call and a voice call. 
Incoming data calls are routed to the LAN over the Ethernet port. If a telephone 
interface has been configured for DOV, incoming data calls made with VBC are 
routed to the LAN over the Ethernet port. Figure 6-1 and Ta b l e 6 - 2 illustrate a 
data call being routed to the LAN. 
Incoming voice calls are forwarded to the analog device over the analog telephone 
port, as shown in Figure 6-2 and Ta b l e 6 - 3. 
Figure 6-1 Data Call over VBC Line
7493741
2
3 
						

							 
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Figure 6-2 Voice Call over VBC Line Table 6-2 Key for Data Call over VBC Line
Callout 
Number Description
1 Analog telephone
2 ISDN BRI line with VBC
3 Central office switch
4 Ethernet LAN
74938
1
2
4
3
Table 6-3 Key for Voice Call over VBC Line
Callout 
Number Description
1 Analog telephone
2 ISDN BRI line with VBC
3 Router
4 Ethernet LAN 
						

							 
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Chapter 6      Configuring Telephone Interfaces
Configuring Advanced Telephone Features
NoteWhen the router is configured for DOV, ISDN BRI calls are made with VBC, 
which has a data rate of 56 kbps, instead of the usual ISDN BRI data rate of 
64 kbps.
Use the following command to configure the router to accept incoming DOV 
calls:
isdn incoming-voice data 56
Follow these steps to configure the router to place outgoing DOV calls:
Distinctive Ringing
A ringing cadence is a pattern of a ringing and a quiet period. There are two types 
of ringing cadences: a primary ringing cadence and distinct ringing. The primary 
cadence is determined by the country where your router is located. In addition to 
the primary cadence, you can configure up to two distinctive rings on a telephone 
port. 
Because the router associates a distinctive ring with the ISDN directory number 
assigned to an interface, you must configure a distinctive ring with a dial peer. For 
information on dial peers and how to configure them, see the “Creating Dial 
Peers” section on page 6-4. Command Purpose
Step 1class voice numberCreate a dialer map.
Step 2map-class dialer voiceDefine a class of shared configuration 
parameters for outgoing calls.
Step 3dialer voice-callConfigure router to make outgoing DOV 
calls.
Step 4dialer isdn speed 56Specify bit rate used on B channel 
associated with specified map class. 
						

							 
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NoteGenerally your telephone service provider assigns one ISDN directory number for 
each SPID. You must have one ISDN directory number for each distinctive ring 
that you set up. Therefore, if you want to set up two distinctive rings, you must 
request an additional ISDN directory number from your telephone service 
provider.
To configure the ringing cadence, insert the following commands into a dial-peer 
configuration:
ring cadence-number 
where cadence-number can be 0, 1, or 2.
Type 0 is a primary ringing cadence—default ringing cadence for country 
your router is located in.
Type 1 is a distinctive ring—0.8 seconds on, 0.4 seconds off, 0.8 seconds on, 
4 seconds off. 
Type 2 is a distinctive ring—0.4 seconds on, 0.2 seconds off, 0.4 seconds on, 
0.2 seconds off, 0.8 seconds on, 4 seconds off.
By default, the ring cadence is set to 0, which means that the interface uses the 
primary ringing cadence.
You can also insert the following command syntax into a dial-peer configuration:
pots distinctive-ring-guard-time milliseconds
where milliseconds can be a number from 50 to 1000. This command configures 
the delay, in milliseconds, before a telephone port can be rung after a previous call 
is disconnected. The default is no delay. 
Caller Identification
In addition to an analog telephone or fax machine, North American users can 
connect a caller ID device to the router telephone ports. This device displays the 
telephone numbers of incoming callers. The Cisco 800 series routers support the 
following caller ID devices:
AT & T  2 5
AT&T 85 Plus 
						

							 
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Chapter 6      Configuring Telephone Interfaces
How to Use Telephones Connected to Cisco 800 Series Routers
CIDCO
Fans Callscreener
GE Caller ID with phone
GE Caller ID without phone
Northwestern Bell Phone, Bell Phone
Radio Shack Caller ID System 350
The Cisco 800 series routers do not support the following devices:
Southwestern Bell Freedom Phone
TTY System
How to Use Telephones Connected to Cisco 800 
Series Routers
This section describes how to make a basic call and how to use the supplementary 
services that you ordered from your telephone service provider. 
Making a Basic Call
To make a basic telephone call, pick up the handset, and dial the number of the 
desired party. 
To make a basic call if your router is connected to a Nippon Telegraph and 
Telephone (NTT) switch, follow these steps:
Step 1Dial the telephone number.
You must enter each digit within 12 seconds of entering the previous digit. If you 
wait longer than 12 seconds, an incomplete set of digits is sent to the switch. 
						

							 
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Step 2Send the entire set of digits to the switch by using one of the following methods:
Press the pound key (#) on the telephone keypad.
Wait 12 seconds without entering any digits. After 12 seconds, the router 
sends the set of digits to the switch.
Disabling Pound Key End-of-Call Function
You can disable the end-of-call function (initiated by pressing the pound key [#]) 
by entering the following command on the telephone keypad:
**98#
NoteThis command applies only to ISDN lines connected to an NTT switch.
You can disable this function if a telephone number you are dialing requires the 
pound key (#) as one of the digits. After entering the **98# command, wait for a 
dial tone and then enter the digits, including the pound key. To send the digits to 
the switch, wait 6 seconds without entering any digits.
The end-of-call function automatically resumes for the next call.
Using Supplementary Services
This section describes how to use the following supplementary services:
Call Holding and Retrieving
Call Waiting
Three-Way Conference Call
Call Transfer
Call Forwarding