paging
To define an extension (ephone-dn) as a paging extension that can be called to broadcast an audio page to a set of Cisco IP phones, use the paging command in ephone-dn configuration mode. To disable this feature, use the no form of this command.
paging [ip multicast-address port udp-port-number]
no paging [ip]
Syntax Description
ip multicast-address |
(Optional) Uses an IP multicast address to multicast voice packets for audio paging; for example, 239.0.1.1. Note that IP phones do not support multicast at 224.x.x.x addresses. Default is that multicast is not used and IP phones are paged individually using IP unicast transmission (up to ten phones). |
port udp-port-number |
(Optional) Uses this UDP port for the multicast. Range is from 2000 to 65535. Default is 2000. |
Command Default
No paging number is established.
Command Modes
Ephone-dn configuration (config-ephone-dn)
Command History
Cisco IOS Release |
Cisco Product |
Modification |
---|---|---|
12.2(2)XT |
Cisco ITS 2.0 |
This command was introduced. |
12.2(8)T |
Cisco ITS 2.0 |
This command was integrated into Cisco IOS Release 12.2(8)T. |
Usage Guidelines
To configure a set of phones to receive an audio page, follow these steps:
- Use the paging command in ephone-dn configuration mode to define a number that people can dial to send a page. The following example defines a paging-dn tag (21) and extension number (34455) to dial to send a page.
ephone-dn 21
paging
number 34455
- Use the paging-dn command in ephone configuration mode to assign the same paging-dn tag that you defined in Step 1 to all the phones that you want to receive the page. This set of phones is called a “paging set.” You can have more than one paging set in a Cisco CME system. The following example assigns the paging-dn tag from Step 1 (21) to two phones (3 and 4) so that they will receive audio pages.
ephone 3
paging-dn 21
ephone 4
paging-dn 21
The paging command configures an ephone-dn as an extension that people can dial to broadcast audio pages to a specified set of idle Cisco IP phones. The extension associated with this command does not appear on any ephone; it is a “dummy” extension. The dn-tag associated with this extension becomes the paging-dn tag for this paging set.
When a person dials the number assigned to the dummy extension and speaks into the phone, the audio stream is sent as a page to the paging set (the set of all phones that have been configured with this paging-dn tag as an argument to the paging-dn command). Idle phones in the paging set automatically answer the paging call in one-way speakerphone mode. Paging sets can be joined into a single combined paging group with the paging group command.
The optional ip keyword and multicast-address argument define a paging multicast address for this paging set. If an IP multicast address is not configured, IP phones are paged individually using IP unicast transmission (to a maximum of ten IP phones). The recommended operation is with an IP multicast address. When multiple paging-dn tags are configured using the paging command, each paging-dn tag should use a unique IP multicast address.
Note |
IP phones do not support multicast at 224.x.x.x addresses. |
Each ephone-dn and paging-dn tag that is used for paging can support a maximum of ten distinct targets (IP addresses and interfaces). A multicast address counts as a single target for each physical interface in use (regardless of the number of phones connected via the interface). Paging using a single IP multicast address that requires output on three different Ethernet interfaces represents use of three counts out of the maximum ten. Each unicast target counts as a single target, such that paging that does not use multicast at all is limited to paging ten phones. For example, ten IP phones paged through multicast on Fast Ethernet interface 0/1.1 plus five IP phones paged through multicast on Fast Ethernet interface 0/1.2 are counted as two targets.
For simultaneous paging to more than one paging ephone-dn, Cisco recommends that you use different IP multicast addresses (not just different port numbers) for paging configuration.
Examples
The following example creates a paging extension number that uses IP multicast paging:
Router(config)# ephone-dn 20
Router(config-ephone-dn) number 2000
Router(config-ephone-dn) paging ip 239.0.1.1 port 2000
A more complete configuration example follows, in which paging sets 20 and 21 are created. Pages to extension 2000 are multicast to ephones 1 and 2. Pages to extension 2001 are multicast to ephones 3 and 4.
ephone-dn 1
number 2345
ephone-dn 2
number 2346
ephone-dn 3
number 2347
ephone-dn 4
number 2348
ephone-dn 20
number 2000
paging ip 239.0.1.20 port 2000
ephone-dn 21
number 2001
paging ip 239.0.1.21 port 2000
ephone 1
button 1:1
paging-dn 20
ephone 2
button 1:2
paging-dn 20
ephone 3
button 1:3
paging-dn 21
ephone 4
button 1:4
paging-dn 21