Operation Manual

Configuring SIP, SPCP, and NAT

Configuring SIP

Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 111

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 Description

AVT Dynamic Payload Any non-standard data. Both sender and receiver

must agree on a number. Ranges from 96 to 127.

Defaults to 101.

INFOREQ Dynamic Payload 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.

G726r16 Dynamic Payload 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.

G726r24 Dynamic Payload 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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