Sdp Payload Types - Linksys SPA9000 Administrator's Manual

Chapter 6 SPA9000 Field Reference
Max RTP ICMP Err
RTCP Tx Interval
No UDP Checksum
Stats In BYE

SDP Payload Types

The configured dynamic payloads are used for outbound calls only where the SPA9000 presents the SDP
offer. For inbound calls with a SDP offer, SPA9000 follow the caller dynamic payload type assignments.
SPA9000 uses the configured codec names in its outbound SDP. SPA9000 ignores the codec names in
incoming SDP for standard payload types (0 – 95). For dynamic payload types, SPA9000 identifies the
codec by the configured codec names. Comparison is case-insensitive.
Field
NSE Dynamic Payload
AVT Dynamic Payload
Document Version 3.01
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.
The default is 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.
The default is 0.
Select yes if you want the SPA9000 to calculate the UDP header checksum for SIP
messages. Otherwise, select no.
The default is 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>.
The default is no.
Description
NSE dynamic payload type. The valid range is 96-127.
The default is 100.
AVT dynamic payload type. The valid range is 96-127.
The default is 101.
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