Operation Manual

Cisco SPA IP Phone Field Reference
SIP Tab
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 241
A
SDP Payload Types
The configured dynamic payloads are used for outbound calls only where the
Cisco SPA9000 presents the SDP offer. For inbound calls with a SDP offer, the
Cisco SPA9000 follows the caller dynamic payload type assignments.
The Cisco SPA9000 uses the configured codec names in its outbound SDP. The
SPA9000 ignores the codec names in incoming SDP for standard payload types
(0-95). For dynamic payload types, the Cisco SPA9000 identifies the codec by the
configured codec names. Comparison is case-insensitive.
No UDP Checksum Select yes if you want the SPA9000 to calculate
the UDP header checksum for SIP messages.
Otherwise, select no.
Defaults to no.
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.
Parameter Description
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