blocking the early media stream, the phone plays the local ringback tone. Otherwise, the phone plays the early
media while waiting for the call to be connected.
You can also configure the parameters in the phone configuration file with XML(cfg.xml) code.
Before you begin
Access the phone administration web page. See Access the Phone Web Interface, on page 104.
Procedure
Step 1 Select Voice > Ext (n).
Step 2 In the SIP Settings section, set the P-Early-Media Support to Yes to control whether the P-Early-Media
header is included in the SIP message for an outgoing call.
You can configure this parameter in the phone configuration XML file (cfg.xml) by entering a string in this
format:
<P-Early-Media_Support_1_ ua="na">No</P-Early-Media_Support_1_>
Options: Yes and No
Default: No
Step 3 Click Submit All Changes.
Enable Peer Firmware Sharing
Peer Firmware Sharing (PFS) is a firmware distribution model which allows a Cisco IP phone to find other
phones of the same model or series on the subnet and share updated firmware files when you need to upgrade
multiple phones all at the same time. PFS uses Cisco Peer-to-Peer-Distribution Protocol (CPPDP) which is a
Cisco proprietary protocol. With CPPDP, all the devices in the subnet form a peer-to-peer hierarchy, and then
copy the firmware or the other files from peer devices to the neighboring devices. To optimize firmware
upgrades, a root phone downloads the firmware image from the load server and then transfers the firmware
to other phones on the subnet using TCP connections.
Peer firmware sharing:
• Limits congestion on TFTP transfers to centralized remove load servers.
• Eliminates the need to manually control firmware upgrades.
• Reduces phone downtime during upgrades when large numbers of phones are reset simultaneously.
Cisco IP Phone 8800 Series Multiplatform Phone Administration Guide for Release 11.3(1) and Later
196
Cisco IP Phone Configuration
Enable Peer Firmware Sharing
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