Linksys SPA9000 Administration Manual page 166

RTP Port Min
RTP Port Max
RTP Packet Size
Max RTP ICMP Err
RTCP Tx Interval
No UDP Checksum
Stats In BYE
Linksys Voice System Administration Guide
Minimum port number for RTP transmission and reception. <RTP Port
Min> and <RTP Port Max> should define a range that contains at least 4
even number ports, such as 100 – 106.
Default: 16384
Maximum port number for RTP transmission and reception.
Default: 16482
Packet size in seconds, which can range from 0.01 to 0.16. Valid values
must be a multiple of 0.01 seconds.
Default: 0.030
Number of successive ICMP errors allowed when transmitting RTP
packets to the peer before the SPA9000 terminates the call. If value is set
to 0, the SPA9000 ignores the limit on ICMP errors.
Default: 0
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
Select yes if you want the SPA9000 to calculate the UDP header
checksum for SIP messages. Otherwise, select no.
Default: no
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
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