Configuring VoIP Punch Peers
The ambassador charge apperceive how to analyze the far-end voice-enabled accessory that will
terminate the call. In a baby arrangement environment, the accessory ability be the IP abode of
the alien device. In a ample environment, anecdotic the accessory ability beggarly pointing to
a Cisco Unified Communications Manager or attendant for abode resolution and CAC
to complete the call.
Follow these accomplish to configure VoIP punch peers:
Step 1. Configure the aisle beyond the arrangement for articulation data.
Step 2. Specify the punch associate as a VoIP punch peer.
Step 3. Use the destination-pattern command to configure a ambit of numbers reachable
by the alien router or gateway.
Step 4. Use the affair ambition command to specify the IP abode of the terminating
router or gateway.
Step 5. (Optional) As a best practice, use the alien accessory loopback abode as the
IP address.
The punch associate defined as a VoIP punch associate alerts the router that it charge action a alarm according
to the assorted dial-peer parameters. The punch associate charge again accelerate the alarm bureaucracy information
in IP packets for carriage beyond the network. Defined ambit ability accommodate the
codec acclimated for compression (for example, VAD) or appearance the packet for antecedence service.
The destination-pattern constant configured for this punch associate is about a ambit of
numbers attainable via the alien router or gateway.
Because this punch associate credibility to a accessory beyond the network, the router needs a destination
IP abode to put in the IP packet. The affair ambition constant allows the administrator
to specify either an IP abode of the absolute router or aperture or another
device. For example, a attendant or Cisco Unified Communications Manager might
return an IP abode of that alien absolute device.
To actuate which IP abode a punch associate should point to, Cisco recommends that you
use a loopback address. The loopback abode is consistently up on a router as continued as the
router is powered on and the interface is not administratively shut down. The acumen an
interface IP abode is not recommended is that if the interface goes down, the alarm will
fail, alike if an alternating aisle to the router exists.
Figure 3-28 shows a cartography defective a VoIP punch associate configured on Router1. Example
3-10 lists the able VoIP dial-peer agreement on Router 1, which is a Cisco voiceenabled
router. The dial-peer articulation 2 voip command notifies the router that punch associate 2 is
a VoIP punch associate with a tag of 2. The destination-pattern 8888 command notifies the
router that this punch associate defines an IP articulation aisle beyond the arrangement for blast number
8888. The affair ambition ipv4:10.18.0.1 command defines the IP abode of the router
connected to the alien telephony device.
170 Authorized Self-Study Guide: Cisco Articulation over IP (CVOICE)
IP Cloud
Ext. 7777 Ext. 8888
Router1 Router2
L0: 10.18.0.1 PBX
Ext 7777 is Calling 8888
V V
Figure 3-28 VoIP Punch Peers
Example 3-10 Agreement for Punch Associate 2 on Router 1
Chapter 3: Routing Calls over Analog Articulation Ports 171
Router1#configure terminal
Router1(config)#dial-peer articulation 2 voip
Router1(config-dialpeer)#destination-pattern 8888
Router1(config-dialpeer)#session ambition ipv4:10.18.0.1
Router1(config-dialpeer)#end