Cisco 7821 Administration Guide

Before you begin
Access the phone administration web page. See Access the Phone Web Page, on page 80.
Procedure
Step 1 Select Voice > SIP.
Step 2 In the SIP Parameters section, select IPv4 or IPv6 in the SIP IP Preference field.
Step 3 In the RTP Parameters section, select IPv4 or IPv6 in the SDP IP Preference field.
For details, see SDP IP Preference in RTP Parameters, on page 238.
Configure the SDP Payload Types
Configured dynamic payloads are used for outbound calls only when the Cisco IP Phone presents a Session
Description Protocol (SDP) offer. For inbound calls with an SDP offer, the phone follows the caller’s assigned
dynamic payload type.
The Cisco IP Phone uses the configured codec names in outbound SDP. For incoming SDP with standard
payload types of 0-95, the phone ignores the codec names. For dynamic payload types, the phone identifies
the codec by the configured codec names (comparison is case-sensitive).
Before you begin
Access the phone administration web page. See Access the Phone Web Page, on page 80.
Procedure
Step 1 Select Voice > SIP.
Step 2 In the SDP Payload Types section, set the value as specified in SDP Payload Types, on page 239.
• AVT Dynamic Payload—Any nonstandard data. Both sender and receiver must agree on a number.
Ranges from 96 to 127. Default: 101.
Step 3 Click Submit All Changes.
Configure the SIP Settings for Extensions
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), where n is an extension number.
Cisco IP Phone 7800 Series Multiplatform Phones Administration Guide
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Cisco IP Phone Installation
Configure the SDP Payload Types

Cisco 7821 Specifications

General

Resolution	396 x 162 pixels
Lines	2
Speakerphone	Yes
Display	3.5-inch (89 mm) monochrome display
Ethernet Ports	2 x 10/100 Ethernet ports
Power	IEEE PoE Class 1
Headset Port	Yes
Protocols	SIP
Audio Codecs	G.711, G.722, G.729, iLBC
Weight	0.9 kg (1.98 lb)