Cisco Systems SPA9000 manual SDP Payload Types section

SPA9000 Field Reference

Voice tab

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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 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
	Linksys/SPA9000-1.0.31(b)). The NTP timestamp used in the
	SR is a snapshot of the SPA9000’s 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.
	Default: 0
No UDP Checksum	Select yes if you want the SPA9000 to calculate the UDP
	header checksum for SIP messages. Otherwise, select no.
	Default: no
Stats In BYE	Determines whether the SPA9000 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>.
	Default: no

Voice tab > SIP page

SDP Payload Types section

The SDP Payload types defines the naming/numbering conventions for the audio codecs used by the SPA9000 when communicating with the ITSP network. Naming should match the ITSP names used. The default values are adequate in most circumstances.

These settings need to be compatible with the ITSP network settings. The ITSP you use will inform you about any specific setting you need to modify on these areas. These parameters have impact on the signaling and audio reliability.

SPA9000 Voice System Administration Guide 208