Cisco SPA1001 Administration Guide - Page 99

SDP Payload Types

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Chapter 5 Linksys ATA Field Reference SIP Tab RTCP Tx Interval No UDP Checksum Stats In BYE Interval for sending out RTCP sender reports on an active connection. It can range from 0 to 255 seconds. During an active connection, the Linksys IP phone 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 @, NAME is set to (or Anonymous if user blocks caller ID), and TOOL is set to the Vendor/Hardware-platform-software-version (such as Linksys/Linksys IP phone-1.0.31(b)). The NTP timestamp used in the SR is a snapshot of the Linksys IP phone's local time, not the time reported by an NTP server. If the Linksys IP phone receives a RR from the peer, it attempts to compute the round trip delay and show it as the value (ms) in the Info section of Linksys IP phone web page. The default is 0. Select yes if you want the Linksys IP phone to calculate the UDP header checksum for SIP messages. Otherwise, select no. The default is no. Determines whether the Linksys IP phone 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=,OS=,PR=,OR=,PL=,JI=,LA=,DU=,EN=,DE=. The default is no. SDP Payload Types Field NSE Dynamic Payload AVT Dynamic Payload INFOREQ Dynamic Payload G726r16 Dynamic Payload G726r24 Dynamic Payload 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. INFOREQ dynamic payload type. There is no default. G.726-16 dynamic payload type. The valid range is 96-127. The default is 98. G.726-24 dynamic payload type. The valid range is 96-127. The default is 97. Document Version 3.2 Linksys IP Phone Administrator Guide 5-15

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5-15
Linksys IP Phone Administrator Guide
Document Version 3.2
Chapter 5
Linksys ATA Field Reference
SIP Tab
SDP Payload Types
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 Linksys IP phone 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/Linksys IP
phone-1.0.31(b)). The NTP timestamp used in the SR is a snapshot of the Linksys IP
phone’s local time, not the time reported by an NTP server. If the Linksys IP phone
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 Linksys IP phone web page.
The default is 0.
No UDP Checksum
Select yes if you want the Linksys IP phone to calculate the UDP header checksum for
SIP messages. Otherwise, select no.
The default is no.
Stats In BYE
Determines whether the Linksys IP phone 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.
Field
Description
NSE Dynamic Payload
NSE dynamic payload type. The valid range is 96-127.
The default is 100.
AVT Dynamic Payload
AVT dynamic payload type. The valid range is 96-127.
The default is 101.
INFOREQ Dynamic Payload
INFOREQ dynamic payload type.
There is no default.
G726r16 Dynamic Payload
G.726-16 dynamic payload type. The valid range is 96-127.
The default is 98.
G726r24 Dynamic Payload
G.726-24 dynamic payload type. The valid range is 96-127.
The default is 97.