Cisco SPA301 Administration Manual page 265

Cisco SPA IP Phone Field Reference
SIP Tab
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide
Parameter
RTCP Tx Interval
Description
Interval for sending out RTCP sender reports on
an active connection. It can range from 0 to 255
seconds. During an active connection, the
SPA9000 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 Cisco/SPA9000-1.0.31(b)). The
NTP timestamp used in the SR is a snapshot of
the SPA9000 local time, not the time reported by
an NTP server. If the SPA9000 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 SPA9000 web
page.
Defaults to 0.
A
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