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Table Of Contents
Information About Intercom Lines
How to Configure Intercom Lines
SCCP: Configuring an Intercom Auto-Answer Line
SIP: Configuring an Intercom Auto-Answer Line
Configuration Examples for Intercom Lines
Feature Information for Intercom Lines
Configuring Intercom Lines
Last Updated: September 10, 2007This chapter describes the intercom features in Cisco Unified Communications Manager Express (Cisco Unified CME).
Finding Feature Information in This Module
Your Cisco Unified CME version may not support all of the features documented in this module. For a list of the versions in which each feature is supported, see the "Feature Information for Intercom Lines" section.
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Information About Intercom Lines
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Information About Intercom Lines
To enable intercom lines, you should understand the following concept:
Intercom Auto-Answer Lines
An intercom line is a dedicated two-way audio path between two phones. Cisco Unified CME supports intercom functionality for one-way and press-to-answer voice connections using a dedicated pair of intercom directory numbers on two phones that speed-dial each other.
When an intercom speed-dial button is pressed, a call is speed-dialed to the directory that is the other half of the dedicated pair. The called phone automatically answers the call in speakerphone mode with mute activated, which provides a one-way voice path from the initiator to the recipient. A beep is sounded when the call is auto-answered to alert the recipient to the incoming call. To respond to the intercom call and open a two-way voice path, the recipient deactivates the mute function by pressing the Mute button or, on phones such as the Cisco Unified IP Phone 7910, lifting the handset.
In Cisco CME 3.2.1 and later versions, you can deactivate the speaker-mute function on intercom calls. For example, if phone user 1 makes an intercom call to phone user 2, both users hear each other on connection when no-mute is configured. The benefit is that people who receive intercom calls can be heard without them having to disable the mute function. The disadvantage is that nearby background sounds and conversations can be heard the moment a person receives an intercom call, regardless of whether they are ready to take a call or not.
Intercom lines cannot be used in shared-line configurations. If a directory number is configured for intercom operation, it must be associated with one IP phone only. The intercom attribute causes an IP phone line to operate as an autodial line for outbound calls and as an autoanswer-with-mute line for inbound calls. Figure 49 shows an intercom between a receptionist and a manager.
To prevent an unauthorized phone from dialing an intercom line (and creating a situation in which a phone automatically answers a nonintercom call), you can assign the intercom a directory number that includes an alphabetic character. No one can dial the alphabetic character from a normal phone, but the phone at the other end of the intercom can be configured to dial the number that contains the alphabetic character through the Cisco Unified CME router. For example, the intercom ephone-dns in Figure 49 are assigned numbers with alphabetic characters so that only the receptionist can call the manager on his or her intercom line, and no one except the manager can call the receptionist on his or her intercom line.
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Figure 49 Intercom Lines
How to Configure Intercom Lines
This section contains the following tasks:
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SCCP: Configuring an Intercom Auto-Answer Line
To enable a two-way audio path between two phones, perform the following steps for each SCCP phone at both ends of the two-way voice path.
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SIP: Configuring an Intercom Auto-Answer Line
To enable the Intercom Auto-Answer feature for SIP phones, perform the following steps for each SIP phone at both ends of the two-way voice path.
Prerequisites
Cisco CME 3.4 or a later version.
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Configuration Examples for Intercom Lines
This section contains the following example:
Intercom Lines: Example
The following example shows an intercom between two Cisco Unified IP phones. In this example, ephone-dn 2 and ephone-dn 4 are normal extensions, while ephone-dn 18 and ephone-dn 19 are set as an intercom pair. Ephone-dn 18 is associated with line button 2 on Cisco Unified IP phone 4. Ephone-dn 19 is associated with line button 2 on Cisco Unified IP phone 5. The two ephone-dns provide a two-way intercom between the two Cisco Unified IP phones.
ephone-dn 2number 5333ephone-dn 4number 5222ephone-dn 18number 5001name "intercom"intercom 5002 barge-inephone-dn 19name "intercom"number 5002intercom 5001 barge-inephone 4button 1:2 2:18ephone 5button 1:4 2:19Where to Go Next
If you are done modifying parameters for phones in Cisco Unified CME, generate a new configuration file and restart the phones. See "Generating Configuration Files for Phones" on page 265.
Paging
The paging feature sets up a one-way audio path to deliver information to a group of phones at one time. For more information, see "Configuring Paging" on page 831.
Additional References
The following sections provide references related to Cisco Unified CME features.
Related Documents
Cisco Unified CME configuration
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Cisco IOS commands
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Cisco IOS configuration
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Phone documentation for Cisco Unified CME
Technical Assistance
Feature Information for Intercom Lines
Table 50 lists the features in this module and enhancements to the features by version.
To determine the correct Cisco IOS release to support a specific Cisco Unified CME version, see the Cisco Unified CME and Cisco IOS Software Version Compatibility Matrix at http://www.cisco.com/en/US/products/sw/voicesw/ps4625/products_documentation_roadmap09186a0080189132.html.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
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Posted: Mon Sep 10 09:32:04 PDT 2007
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