Configuring Telepresence E911 IP Phone Support

Finding Feature Information

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Information About TelePresence E911 IP Phone Support

You can use a Cisco IP phone as a user interface in a Cisco TelePresence System. In this configuration, the IP phone must always be on and available for emergency calls. If the power to the codec in the Cisco TelePresence System fails, is disrupted or if the codec fails, the IP phone is not available.

Figure 1. Phone-Codec-Switch Connection


Table 1.
Term

Switch

Cisco TelePresence System with a codec

IP phone

Use the TelePresence E911 IP phone support feature to ensure that the IP phone is always on and available for emergency calls. When a CDP-enabled IP phone is connected to the codec through a switch, you can configure the switch to forward CDP packets from the IP phone only to the codec in the Cisco TelePresence System. The switch adds ingress-egress port pairs to the CDP forwarding table. An ingress-egress port pair is a one-to-one mapping between an ingress switch port connected to the IP phone and an egress switch port connected to the codec.

The IP phone and the codec communicate through the IP network. If power to the codec fails, is disrupted or if the codec fails, the IP phone is still connected to the IP network and is available for emergency calls.

The switch forwards all CDP packets received on the ingress port to the egress port. If multiple IP phones are connected to the codec through a single port on the switch, only one phone communicates with it through the IP network. This phone is usually the one that sent the first CDP packet received by the codec.

Figure 2. Phone-Codec-Switch Connection


Table 2.
Term

Switch

Cisco TelePresence System with a codec

CDP-enabled IP phone

How to Configure TelePresence E911 IP Phone Support

Configuration Guidelines

  • You must use only CDP-enabled phones with TelePresence E911 IP phone support.

  • You can connect the IP phone and codec in the Cisco TelePresence System through any two ports in a switch stack.

Enabling TelePresence E911 IP Phone Support

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. cdp forward ingress port-idegress port-id
  4. end
  5. show cdp forward
  6. show running-config
  7. copy running-config startup-config

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Switch> enable

Enables privileged EXEC mode. Enter your password if prompted.

Step 2

configure terminal

Example:


Switch# configure terminal

Enters the global configuration mode.

Step 3

cdp forward ingress port-idegress port-id

Configures an ingress-egress port pair.

  • ingress port -id - Specifies the port connected to the CDP-enabled IP phone.

  • egress port -id - Specifies the port connected to the codec in the Cisco TelePresence System.

Repeat this step to configure additional ingress-egress port pairs.
Step 4

end

Example:


Switch(config)# end

Returns to privileged EXEC mode.

Step 5

show cdp forward

Verifies the ingress-egress port pairs. The command output also shows the number of forwarded and dropped packets.

Step 6

show running-config

Example:


Switch# show running-config

Verifies your entries.

Step 7

copy running-config startup-config

Example:


Switch# copy running-config startup-config

(Optional) Saves your entries in the configuration file.