Configuring Sdp Payload Types - Cisco SPA 501G Administration Manual

Configuring SIP, SPCP, and NAT
Configuring SIP
STEP 5
STEP 1
STEP 2
STEP 3
STEP 4
Cisco SPA 500 Series and WIP310 IP Phone Administration Guide
• Symmetric RTP—Enable symmetric RTP operation. If enabled, sends RTP
packets to the source address and port of the last received valid inbound
RTP packet. If disabled (or before the first RTP packet arrives) sends RTP to
the destination as indicated in the inbound SDP. Defaults to no.
• Stats in BYE—Determines whether the IP phone includes the P-RTP-Stat
header or response to a BYE message. The header contains the RTP
statistics of the current call. Select yes or no from the drop-down menu. The
format of the P-RTP-Stat header is:
P-RTP-State: PS=<packets sent>,OS=<octets
sent>,PR=<packets received>,OR=<octets
received>,PL=<packets lost>,JI=<jitter in ms>,LA=<delay
in ms>,DU=<call duration in s>,EN=<encoder>,DE=<decoder>
Defaults to no.
Click Submit All Changes.

Configuring SDP Payload Types

Configured dynamic payloads are used for outbound calls only when the Cisco IP
phone presents an SDP offer. For inbound calls with an 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:
Log in to the web administration interface.
Click Admin Login and advanced.
Click the SIP tab.
Under SDP Payload Types, configure the fields shown in the following table and
click Submit All Changes.
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