Linksys SPA932 Manual De Usuario

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Linksys SPA9x2 Phone Administration Guide
Cisco Confidential--First Draft
136
SIP Tab
SPA9x2 Phone Field Reference
RTCP Tx Interval 
Interval for sending out RTCP sender reports on an active 
connection. It can range from 0 to 255 seconds. During 
an active connection, the SPA9x2 can be programmed to 
send out compound RTCP packet on the connection. 
Each compound RTP packet except the last one contains 
a SR (Sender Report) and a SDES (Source Description). 
The last RTCP packet contains an additional BYE packet. 
Each SR except the last one contains exactly 1 RR 
(Receiver Report); the last SR carries no RR. The SDES 
contains CNAME, NAME, and TOOL identifiers. The 
CNAME is set to <User ID>@<Proxy>, NAME is set to 
<Display Name> (or Anonymous if user blocks caller ID), 
and TOOL is set to the Vendor/Hardware-platform-
software-version (such as Linksys/SPA9x2-1.0.31(b)). The 
NTP timestamp used in the SR is a snapshot of the 
SPA9x2’s local time, not the time reported by an NTP 
server. If the SPA9x2 receives a RR from the peer, it 
attempts to compute the round trip delay and show it as 
the <Call Round Trip Delay> value (ms) in the Info 
section of SPA9x2 web page.
Defaults to 0.
No UDP Checksum 
Select yes if you want the SPA9x2 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 yes.
Stats In BYE 
Determines whether the SPA9x2 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