Linksys SPA922 Rtcp Tx Interval, Send out compound Rtcp packet on the connection, No UDP Checksum

SPA9x2 Phone Field Reference

SIP Tab

Parameter	Description
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.

Linksys SPA9x2 Phone Administration Guide 136