Cisco 8851 Administration Guide

Network Settings
DescriptionParameter
Time of service (ToS)/differentiated services
(DiffServ) field value in UDP IP packets carrying a
SIP message. Default: 0x68.
SIP TOS/DiffServ Value
Value for the ToS field of voice data packets.
Sets the priority for voice packets in data traffic.
Default: 0xb8.
RTP ToS/DiffServ Value
Value for the ToS field of video data packets.
Sets the priority for video packets in data traffic.
Default: 0x54.
Video RTP ToS/DiffServ Value
SIP Settings
DescriptionParameter
Select the transport protocol for SIP messages:
• UDP
• TCP
• TLS
• AUTO
AUTO allows the phone to select the appropriate
protocol automatically, based on the NAPTR records
on the DNS server. See Configure the SIP Transport,
on page 219 for more details.
Default: UDP
SIP Transport
The phone's port number for SIP message listening
and transmission.
Specify the port number here only when you are using
UDP as the SIP transport protocol.
If you are using TCP, the system uses a random port
within the range specified in SIP TCP Port Min and
SIP TCP Port Max on the Voice > SIP tab.
If you need to specify a port of SIP proxy server, you
can specify it using the Proxy field (Proxy and
Registration, on page 327) or the XSI Host Server
field (XSI Line Service, on page 330).
Default: 5060
SIP Port
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
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Cisco IP Phone Troubleshooting
Network Settings

Cisco 8851 Specifications

General

Resolution	800 x 480 pixels
Network Interfaces	Dual Gigabit Ethernet ports
Headset Port	Yes
Audio	Wideband audio
Ethernet	10/100/1000 Mbps
USB	Yes, USB 2.0
Power	IEEE 802.3af/at Power over Ethernet (PoE)
Protocols	SIP
PoE	Yes
Codec Support	G.711, G.722, G.729, iLBC
Headset Connector	RJ9
Lines	Up to 5 lines
Dimensions	229 x 256 x 41 mm (excluding foot stand)
Weight	1.2 kg