Before you begin
Access the phone administration web page. See Access the Phone Web Page, on page 80.
Procedure
Step 1 Select Voice > Extension.
Step 2 In the SIP Settings section, set the Privacy Header field as described in the SIP Settings, on page 280.
Step 3 Click Submit All Changes.
Enable P-Early-Media Support
You can determine whether to include the P-Early-Media header in the SIP message of outgoing calls. The
P-Early-Media header contains the status of the early media stream. If the status indicates that the network is
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.
Before you begin
Access the phone administration web page. See Access the Phone Web Page, on page 80.
Procedure
Step 1 Select Voice > Ext (n).
Step 2 In the SIP Settings section, set the P-Early-Media Support field as described in SIP Settings, on page 280.
Step 3 Click Submit All Changes.
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 7800 Series Multiplatform Phones Administration Guide
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Cisco IP Phone Administration
Enable P-Early-Media Support
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