Configuring Sdp Payload Types - Cisco 521SG - Unified IP Phone VoIP Administration Manual

Configuring SIP, SPCP, and NAT
Configuring SIP
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide

Configuring 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
a SDP offer, the phone follows the caller's assigned dynamic payload type.
Cisco IP phones use the configured codec names in outbound SDP. For incoming
SDP with standard payload types of 0-95, the Cisco IP phone ignores the codec
names. For dynamic payload types, the Cisco IP phone identifies the codec by the
configured codec names (comparison is case-sensitive).
To configure SDP payload types, navigate to Admin Login > advanced > Voice >
SIP. Under SDP Payload Types, configure these parameters:
Parameter
AVT Dynamic Payload
INFOREQ Dynamic Payload
G726r16 Dynamic Payload
G726r24 Dynamic Payload
Description
Any non-standard data. Both sender and receiver
must agree on a number. Ranges from 96 to 127.
Defaults to 101.
Codec number used in the SIP messaging for the
Dynamic Payload size mechanism. This number
should match the number configured in the
network/other party to enable the use of Dynamic
Payload. The best range is 96 to 27 for any
dynamic payload type. Defaults to blank.
RTP Payload Type Number that indicates the
transmitted packet is using the G.726 codec.
Other codecs have preassigned payload
numbers that you do not have to be set, but G.726
does not.. Ranges from 96 to 127. Defaults to 98.
Not applicable to Cisco SPA525G or
Cisco SPA525G2.
RTP Payload Type Number that indicates the
transmitted packet is using the G.726-24 codec.
Ranges from 96 to 127. Defaults to 97.
Not applicable to Cisco SPA525G or
Cisco SPA525G2.
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