Cisco SPA112 Administration Guide - Page 69

Receiver Report; the last SR carries no RR. The, Report and a SDES Source Description The last

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Configuring Voice Configuring Voice Settings 4 Field RTCP Tx Interval No UDP Checksum Stats In BYE Description Interval for sending out RTCP sender reports on an active connection. It can range from 0 to 255 seconds. During an active connection, the ATA 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-softwareversion. The NTP timestamp used in the SR is a snapshot of the ATA's local time, not the time reported by an NTP server. If the ATA 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) on the Voice > Information page. Default setting: 0. Select yes if you want the ATA to calculate the UDP header checksum for SIP messages. Otherwise, select no. Default setting: no. Determines whether the ATA includes the P-RTPStat header or response in a BYE message. The header contains the RTP statistics of the current call. Select yes or no from the drop-down list. The format of the P-RTP-Stat header is: P-RTP-State: PS=,OS=,PR=,OR=,PL=,JI=,LA=,DU=,EN=,DE=. Default setting: Yes Cisco SPA100 Series Phone Adapters Administration Guide 69

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Configuring Voice
Configuring Voice Settings
Cisco SPA100 Series Phone Adapters Administration Guide
69
4
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 ATA 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. The NTP timestamp used in the SR is a
snapshot of the ATA’s local time, not the time
reported by an NTP server. If the ATA 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) on the
Voice > Information
page.
Default setting: 0.
No UDP Checksum
Select yes if you want the ATA to calculate the UDP
header checksum for SIP messages. Otherwise,
select no. Default setting: no.
Stats In BYE
Determines whether the ATA includes the P-RTP-
Stat header or response in a BYE message. The
header contains the RTP statistics of the current
call. Select
yes
or
no
from the drop-down list. 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
ins>,EN=<encoder>,DE=<decoder>. Default
setting: Yes
Field
Description